Finding the Fourth Proportional to 13,359.76, 18,436.56 and 7,391.92

Step by Step Solution

1. Step 1: Write the proportion equation
   13,359.76 : 18,436.56 = 7,391.92 : x
2. Step 2: Convert to fraction form
   13,359.76/18,436.56 = 7,391.92/x
3. Step 3: Cross multiply
   13,359.76x = 18,436.56 × 7,391.92
4. Step 4: Simplify right side
   13,359.76x = 136,281,576.60
5. Step 5: Solve for x
   x = 136,281,576.60/13,359.76
6. Step 6: Final answer
   x = 10,200.90