Finding the Fourth Proportional to 86,632.12, 129,981.42 and 30,478.06

Step by Step Solution

1. Step 1: Write the proportion equation
   86,632.12 : 129,981.42 = 30,478.06 : x
2. Step 2: Convert to fraction form
   86,632.12/129,981.42 = 30,478.06/x
3. Step 3: Cross multiply
   86,632.12x = 129,981.42 × 30,478.06
4. Step 4: Simplify right side
   86,632.12x = 3,961,581,517.65
5. Step 5: Solve for x
   x = 3,961,581,517.65/86,632.12
6. Step 6: Final answer
   x = 45,728.78