Finding the Fourth Proportional to 13,124.27, 18,111.16 and 7,156.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.27 : 18,111.16 = 7,156.05 : x
2. Step 2: Convert to fraction form
   13,124.27/18,111.16 = 7,156.05/x
3. Step 3: Cross multiply
   13,124.27x = 18,111.16 × 7,156.05
4. Step 4: Simplify right side
   13,124.27x = 129,604,330.74
5. Step 5: Solve for x
   x = 129,604,330.74/13,124.27
6. Step 6: Final answer
   x = 9,875.17