Finding the Fourth Proportional to 9,139.25, 12,612.11 and 4,947.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.25 : 12,612.11 = 4,947.50 : x
2. Step 2: Convert to fraction form
   9,139.25/12,612.11 = 4,947.50/x
3. Step 3: Cross multiply
   9,139.25x = 12,612.11 × 4,947.50
4. Step 4: Simplify right side
   9,139.25x = 62,398,421.02
5. Step 5: Solve for x
   x = 62,398,421.02/9,139.25
6. Step 6: Final answer
   x = 6,827.52