Finding the Fourth Proportional to 13,124.76, 18,111.84 and 7,156.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.76 : 18,111.84 = 7,156.55 : x
2. Step 2: Convert to fraction form
   13,124.76/18,111.84 = 7,156.55/x
3. Step 3: Cross multiply
   13,124.76x = 18,111.84 × 7,156.55
4. Step 4: Simplify right side
   13,124.76x = 129,618,288.55
5. Step 5: Solve for x
   x = 129,618,288.55/13,124.76
6. Step 6: Final answer
   x = 9,875.86