Finding the Fourth Proportional to 9,139.10, 12,611.97 and 4,947.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.10 : 12,611.97 = 4,947.35 : x
2. Step 2: Convert to fraction form
   9,139.10/12,611.97 = 4,947.35/x
3. Step 3: Cross multiply
   9,139.10x = 12,611.97 × 4,947.35
4. Step 4: Simplify right side
   9,139.10x = 62,395,766.72
5. Step 5: Solve for x
   x = 62,395,766.72/9,139.10
6. Step 6: Final answer
   x = 6,827.35