Finding the Fourth Proportional to 9,139.35, 12,612.32 and 4,947.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.35 : 12,612.32 = 4,947.60 : x
2. Step 2: Convert to fraction form
   9,139.35/12,612.32 = 4,947.60/x
3. Step 3: Cross multiply
   9,139.35x = 12,612.32 × 4,947.60
4. Step 4: Simplify right side
   9,139.35x = 62,400,714.43
5. Step 5: Solve for x
   x = 62,400,714.43/9,139.35
6. Step 6: Final answer
   x = 6,827.70