Finding the Fourth Proportional to 86,007.90, 128,793.15 and 82,071.30

Step by Step Solution

1. Step 1: Write the proportion equation
   86,007.90 : 128,793.15 = 82,071.30 : x
2. Step 2: Convert to fraction form
   86,007.90/128,793.15 = 82,071.30/x
3. Step 3: Cross multiply
   86,007.90x = 128,793.15 × 82,071.30
4. Step 4: Simplify right side
   86,007.90x = 10,570,221,251.60
5. Step 5: Solve for x
   x = 10,570,221,251.60/86,007.90
6. Step 6: Final answer
   x = 122,898.26