Finding the Fourth Proportional to 1,143,436.56, 1,712,868.15 and 687,776.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143,436.56 : 1,712,868.15 = 687,776.15 : x
2. Step 2: Convert to fraction form
   1,143,436.56/1,712,868.15 = 687,776.15/x
3. Step 3: Cross multiply
   1,143,436.56x = 1,712,868.15 × 687,776.15
4. Step 4: Simplify right side
   1,143,436.56x = 1,178,069,853,100.28
5. Step 5: Solve for x
   x = 1,178,069,853,100.28/1,143,436.56
6. Step 6: Final answer
   x = 1,030,288.78