Finding the Fourth Proportional to 13,216.92, 18,242.82 and 7,915.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,216.92 : 18,242.82 = 7,915.88 : x
2. Step 2: Convert to fraction form
   13,216.92/18,242.82 = 7,915.88/x
3. Step 3: Cross multiply
   13,216.92x = 18,242.82 × 7,915.88
4. Step 4: Simplify right side
   13,216.92x = 144,407,973.98
5. Step 5: Solve for x
   x = 144,407,973.98/13,216.92
6. Step 6: Final answer
   x = 10,925.99