Finding the Fourth Proportional to 8,332.72, 12,501.52 and 3,139

Step by Step Solution

1. Step 1: Write the proportion equation
   8,332.72 : 12,501.52 = 3,139 : x
2. Step 2: Convert to fraction form
   8,332.72/12,501.52 = 3,139/x
3. Step 3: Cross multiply
   8,332.72x = 12,501.52 × 3,139
4. Step 4: Simplify right side
   8,332.72x = 39,242,271.28
5. Step 5: Solve for x
   x = 39,242,271.28/8,332.72
6. Step 6: Final answer
   x = 4,709.42