Finding the Fourth Proportional to 9,238.80, 12,758.52 and 7,904.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,238.80 : 12,758.52 = 7,904.70 : x
2. Step 2: Convert to fraction form
   9,238.80/12,758.52 = 7,904.70/x
3. Step 3: Cross multiply
   9,238.80x = 12,758.52 × 7,904.70
4. Step 4: Simplify right side
   9,238.80x = 100,852,273.04
5. Step 5: Solve for x
   x = 100,852,273.04/9,238.80
6. Step 6: Final answer
   x = 10,916.17