Finding the Fourth Proportional to 1,326,086.70, 1,988,830.89 and 427,356.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,326,086.70 : 1,988,830.89 = 427,356.06 : x
2. Step 2: Convert to fraction form
   1,326,086.70/1,988,830.89 = 427,356.06/x
3. Step 3: Cross multiply
   1,326,086.70x = 1,988,830.89 × 427,356.06
4. Step 4: Simplify right side
   1,326,086.70x = 849,938,933,156.69
5. Step 5: Solve for x
   x = 849,938,933,156.69/1,326,086.70
6. Step 6: Final answer
   x = 640,937.68