Finding the Fourth Proportional to 13,124.32, 18,111.30 and 7,156.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.32 : 18,111.30 = 7,156.03 : x
2. Step 2: Convert to fraction form
   13,124.32/18,111.30 = 7,156.03/x
3. Step 3: Cross multiply
   13,124.32x = 18,111.30 × 7,156.03
4. Step 4: Simplify right side
   13,124.32x = 129,605,006.14
5. Step 5: Solve for x
   x = 129,605,006.14/13,124.32
6. Step 6: Final answer
   x = 9,875.18