Finding the Fourth Proportional to 12,158.72, 16,783.20 and 7,124.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,158.72 : 16,783.20 = 7,124.56 : x
2. Step 2: Convert to fraction form
   12,158.72/16,783.20 = 7,124.56/x
3. Step 3: Cross multiply
   12,158.72x = 16,783.20 × 7,124.56
4. Step 4: Simplify right side
   12,158.72x = 119,572,915.39
5. Step 5: Solve for x
   x = 119,572,915.39/12,158.72
6. Step 6: Final answer
   x = 9,834.33