Finding the Fourth Proportional to 9,139.50, 12,612.51 and 4,947.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.50 : 12,612.51 = 4,947.78 : x
2. Step 2: Convert to fraction form
   9,139.50/12,612.51 = 4,947.78/x
3. Step 3: Cross multiply
   9,139.50x = 12,612.51 × 4,947.78
4. Step 4: Simplify right side
   9,139.50x = 62,403,924.73
5. Step 5: Solve for x
   x = 62,403,924.73/9,139.50
6. Step 6: Final answer
   x = 6,827.94