Finding the Fourth Proportional to 13,124.56, 18,111.50 and 7,156.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.56 : 18,111.50 = 7,156.35 : x
2. Step 2: Convert to fraction form
   13,124.56/18,111.50 = 7,156.35/x
3. Step 3: Cross multiply
   13,124.56x = 18,111.50 × 7,156.35
4. Step 4: Simplify right side
   13,124.56x = 129,612,106.69
5. Step 5: Solve for x
   x = 129,612,106.69/13,124.56
6. Step 6: Final answer
   x = 9,875.54