Finding the Fourth Proportional to 1,272,078.72, 1,755,510.72 and 699,139.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272,078.72 : 1,755,510.72 = 699,139.20 : x
2. Step 2: Convert to fraction form
   1,272,078.72/1,755,510.72 = 699,139.20/x
3. Step 3: Cross multiply
   1,272,078.72x = 1,755,510.72 × 699,139.20
4. Step 4: Simplify right side
   1,272,078.72x = 1,227,346,360,372.22
5. Step 5: Solve for x
   x = 1,227,346,360,372.22/1,272,078.72
6. Step 6: Final answer
   x = 964,835.23