Finding the Fourth Proportional to 8,930.57, 12,309.98 and 7,039.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,930.57 : 12,309.98 = 7,039.08 : x
2. Step 2: Convert to fraction form
   8,930.57/12,309.98 = 7,039.08/x
3. Step 3: Cross multiply
   8,930.57x = 12,309.98 × 7,039.08
4. Step 4: Simplify right side
   8,930.57x = 86,650,898.82
5. Step 5: Solve for x
   x = 86,650,898.82/8,930.57
6. Step 6: Final answer
   x = 9,702.73