Finding the Fourth Proportional to 85,471.89, 128,209.48 and 26,307.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,471.89 : 128,209.48 = 26,307.50 : x
2. Step 2: Convert to fraction form
   85,471.89/128,209.48 = 26,307.50/x
3. Step 3: Cross multiply
   85,471.89x = 128,209.48 × 26,307.50
4. Step 4: Simplify right side
   85,471.89x = 3,372,870,895.10
5. Step 5: Solve for x
   x = 3,372,870,895.10/85,471.89
6. Step 6: Final answer
   x = 39,461.76