Finding the Fourth Proportional to 1,272,128.55, 1,755,517 and 699,156.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272,128.55 : 1,755,517 = 699,156.42 : x
2. Step 2: Convert to fraction form
   1,272,128.55/1,755,517 = 699,156.42/x
3. Step 3: Cross multiply
   1,272,128.55x = 1,755,517 × 699,156.42
4. Step 4: Simplify right side
   1,272,128.55x = 1,227,380,980,969.14
5. Step 5: Solve for x
   x = 1,227,380,980,969.14/1,272,128.55
6. Step 6: Final answer
   x = 964,824.65