Finding the Fourth Proportional to 825,642.72, 1,139,400 and 463,147.20

Step by Step Solution

1. Step 1: Write the proportion equation
   825,642.72 : 1,139,400 = 463,147.20 : x
2. Step 2: Convert to fraction form
   825,642.72/1,139,400 = 463,147.20/x
3. Step 3: Cross multiply
   825,642.72x = 1,139,400 × 463,147.20
4. Step 4: Simplify right side
   825,642.72x = 527,709,919,680
5. Step 5: Solve for x
   x = 527,709,919,680/825,642.72
6. Step 6: Final answer
   x = 639,150.45