Finding the Fourth Proportional to 863,385.55, 1,191,939.18 and 519,298.29

Step by Step Solution

1. Step 1: Write the proportion equation
   863,385.55 : 1,191,939.18 = 519,298.29 : x
2. Step 2: Convert to fraction form
   863,385.55/1,191,939.18 = 519,298.29/x
3. Step 3: Cross multiply
   863,385.55x = 1,191,939.18 × 519,298.29
4. Step 4: Simplify right side
   863,385.55x = 618,971,978,931.69
5. Step 5: Solve for x
   x = 618,971,978,931.69/863,385.55
6. Step 6: Final answer
   x = 716,912.60