Finding the Fourth Proportional to 9,111.36, 12,570.72 and 7,429.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.36 : 12,570.72 = 7,429.92 : x
2. Step 2: Convert to fraction form
   9,111.36/12,570.72 = 7,429.92/x
3. Step 3: Cross multiply
   9,111.36x = 12,570.72 × 7,429.92
4. Step 4: Simplify right side
   9,111.36x = 93,399,443.94
5. Step 5: Solve for x
   x = 93,399,443.94/9,111.36
6. Step 6: Final answer
   x = 10,250.88