Finding the Fourth Proportional to 9,139.57, 12,612.60 and 4,947.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.57 : 12,612.60 = 4,947.82 : x
2. Step 2: Convert to fraction form
   9,139.57/12,612.60 = 4,947.82/x
3. Step 3: Cross multiply
   9,139.57x = 12,612.60 × 4,947.82
4. Step 4: Simplify right side
   9,139.57x = 62,404,874.53
5. Step 5: Solve for x
   x = 62,404,874.53/9,139.57
6. Step 6: Final answer
   x = 6,827.99