Finding the Fourth Proportional to 13,124.57, 18,111.99 and 7,156.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.57 : 18,111.99 = 7,156.34 : x
2. Step 2: Convert to fraction form
   13,124.57/18,111.99 = 7,156.34/x
3. Step 3: Cross multiply
   13,124.57x = 18,111.99 × 7,156.34
4. Step 4: Simplify right side
   13,124.57x = 129,615,432.17
5. Step 5: Solve for x
   x = 129,615,432.17/13,124.57
6. Step 6: Final answer
   x = 9,875.79