Finding the Fourth Proportional to 861,623.72, 1,189,200.18 and 499,047.50

Step by Step Solution

1. Step 1: Write the proportion equation
   861,623.72 : 1,189,200.18 = 499,047.50 : x
2. Step 2: Convert to fraction form
   861,623.72/1,189,200.18 = 499,047.50/x
3. Step 3: Cross multiply
   861,623.72x = 1,189,200.18 × 499,047.50
4. Step 4: Simplify right side
   861,623.72x = 593,467,376,828.55
5. Step 5: Solve for x
   x = 593,467,376,828.55/861,623.72
6. Step 6: Final answer
   x = 688,777.90