Finding the Fourth Proportional to 12,588.43, 18,856.72 and 7,381.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,588.43 : 18,856.72 = 7,381.75 : x
2. Step 2: Convert to fraction form
   12,588.43/18,856.72 = 7,381.75/x
3. Step 3: Cross multiply
   12,588.43x = 18,856.72 × 7,381.75
4. Step 4: Simplify right side
   12,588.43x = 139,195,592.86
5. Step 5: Solve for x
   x = 139,195,592.86/12,588.43
6. Step 6: Final answer
   x = 11,057.42