Finding the Fourth Proportional to 298,956,752.10, 448,435,128.15 and 137,713,616.10

Step by Step Solution

1. Step 1: Write the proportion equation
   298,956,752.10 : 448,435,128.15 = 137,713,616.10 : x
2. Step 2: Convert to fraction form
   298,956,752.10/448,435,128.15 = 137,713,616.10/x
3. Step 3: Cross multiply
   298,956,752.10x = 448,435,128.15 × 137,713,616.10
4. Step 4: Simplify right side
   298,956,752.10x = 61,755,623,083,803,400
5. Step 5: Solve for x
   x = 61,755,623,083,803,400/298,956,752.10
6. Step 6: Final answer
   x = 206,570,424.15