Finding the Fourth Proportional to 85,457.91, 128,139.89 and 26,277.15

Step by Step Solution

1. Step 1: Write the proportion equation
   85,457.91 : 128,139.89 = 26,277.15 : x
2. Step 2: Convert to fraction form
   85,457.91/128,139.89 = 26,277.15/x
3. Step 3: Cross multiply
   85,457.91x = 128,139.89 × 26,277.15
4. Step 4: Simplify right side
   85,457.91x = 3,367,150,979.13
5. Step 5: Solve for x
   x = 3,367,150,979.13/85,457.91
6. Step 6: Final answer
   x = 39,401.28