Finding the Fourth Proportional to 13,124.64, 18,111.52 and 7,156.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.64 : 18,111.52 = 7,156.20 : x
2. Step 2: Convert to fraction form
   13,124.64/18,111.52 = 7,156.20/x
3. Step 3: Cross multiply
   13,124.64x = 18,111.52 × 7,156.20
4. Step 4: Simplify right side
   13,124.64x = 129,609,659.42
5. Step 5: Solve for x
   x = 129,609,659.42/13,124.64
6. Step 6: Final answer
   x = 9,875.29