Finding the Fourth Proportional to 85,558.83, 128,350.30 and 26,399.31

Step by Step Solution

1. Step 1: Write the proportion equation
   85,558.83 : 128,350.30 = 26,399.31 : x
2. Step 2: Convert to fraction form
   85,558.83/128,350.30 = 26,399.31/x
3. Step 3: Cross multiply
   85,558.83x = 128,350.30 × 26,399.31
4. Step 4: Simplify right side
   85,558.83x = 3,388,359,070.42
5. Step 5: Solve for x
   x = 3,388,359,070.42/85,558.83
6. Step 6: Final answer
   x = 39,602.68