Finding the Fourth Proportional to 8,059.30, 12,085.88 and 3,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,059.30 : 12,085.88 = 3,128.30 : x
2. Step 2: Convert to fraction form
   8,059.30/12,085.88 = 3,128.30/x
3. Step 3: Cross multiply
   8,059.30x = 12,085.88 × 3,128.30
4. Step 4: Simplify right side
   8,059.30x = 37,808,272.98
5. Step 5: Solve for x
   x = 37,808,272.98/8,059.30
6. Step 6: Final answer
   x = 4,691.26