Finding the Fourth Proportional to 85,499.81, 128,251.91 and 40,510.61

Step by Step Solution

1. Step 1: Write the proportion equation
   85,499.81 : 128,251.91 = 40,510.61 : x
2. Step 2: Convert to fraction form
   85,499.81/128,251.91 = 40,510.61/x
3. Step 3: Cross multiply
   85,499.81x = 128,251.91 × 40,510.61
4. Step 4: Simplify right side
   85,499.81x = 5,195,562,567.78
5. Step 5: Solve for x
   x = 5,195,562,567.78/85,499.81
6. Step 6: Final answer
   x = 60,766.95