Finding the Fourth Proportional to 427,468,131.38, 641,616,830.17 and 206,295,120.07

Step by Step Solution

1. Step 1: Write the proportion equation
   427,468,131.38 : 641,616,830.17 = 206,295,120.07 : x
2. Step 2: Convert to fraction form
   427,468,131.38/641,616,830.17 = 206,295,120.07/x
3. Step 3: Cross multiply
   427,468,131.38x = 641,616,830.17 × 206,295,120.07
4. Step 4: Simplify right side
   427,468,131.38x = 132,362,421,018,852,928
5. Step 5: Solve for x
   x = 132,362,421,018,852,928/427,468,131.38
6. Step 6: Final answer
   x = 309,642,781.07