Finding the Fourth Proportional to 13,124.28, 18,102.24 and 7,815

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.28 : 18,102.24 = 7,815 : x
2. Step 2: Convert to fraction form
   13,124.28/18,102.24 = 7,815/x
3. Step 3: Cross multiply
   13,124.28x = 18,102.24 × 7,815
4. Step 4: Simplify right side
   13,124.28x = 141,469,005.60
5. Step 5: Solve for x
   x = 141,469,005.60/13,124.28
6. Step 6: Final answer
   x = 10,779.18