Finding the Fourth Proportional to 9,429.24, 13,008.72 and 7,188.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,429.24 : 13,008.72 = 7,188.80 : x
2. Step 2: Convert to fraction form
   9,429.24/13,008.72 = 7,188.80/x
3. Step 3: Cross multiply
   9,429.24x = 13,008.72 × 7,188.80
4. Step 4: Simplify right side
   9,429.24x = 93,517,086.34
5. Step 5: Solve for x
   x = 93,517,086.34/9,429.24
6. Step 6: Final answer
   x = 9,917.78