Finding the Fourth Proportional to 399,401.90, 599,108.15 and 133,162.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,401.90 : 599,108.15 = 133,162.50 : x
2. Step 2: Convert to fraction form
   399,401.90/599,108.15 = 133,162.50/x
3. Step 3: Cross multiply
   399,401.90x = 599,108.15 × 133,162.50
4. Step 4: Simplify right side
   399,401.90x = 79,778,739,024.38
5. Step 5: Solve for x
   x = 79,778,739,024.38/399,401.90
6. Step 6: Final answer
   x = 199,745.52