Finding the Fourth Proportional to 9,139.87, 12,613.04 and 4,948.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.87 : 12,613.04 = 4,948.12 : x
2. Step 2: Convert to fraction form
   9,139.87/12,613.04 = 4,948.12/x
3. Step 3: Cross multiply
   9,139.87x = 12,613.04 × 4,948.12
4. Step 4: Simplify right side
   9,139.87x = 62,410,835.48
5. Step 5: Solve for x
   x = 62,410,835.48/9,139.87
6. Step 6: Final answer
   x = 6,828.42