Finding the Fourth Proportional to 309,764.07, 464,651.20 and 85,123.10

Step by Step Solution

1. Step 1: Write the proportion equation
   309,764.07 : 464,651.20 = 85,123.10 : x
2. Step 2: Convert to fraction form
   309,764.07/464,651.20 = 85,123.10/x
3. Step 3: Cross multiply
   309,764.07x = 464,651.20 × 85,123.10
4. Step 4: Simplify right side
   309,764.07x = 39,552,550,562.72
5. Step 5: Solve for x
   x = 39,552,550,562.72/309,764.07
6. Step 6: Final answer
   x = 127,686.05