Finding the Fourth Proportional to 22,140.32, 30,553.78 and 13,188.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,140.32 : 30,553.78 = 13,188.20 : x
2. Step 2: Convert to fraction form
   22,140.32/30,553.78 = 13,188.20/x
3. Step 3: Cross multiply
   22,140.32x = 30,553.78 × 13,188.20
4. Step 4: Simplify right side
   22,140.32x = 402,949,301.50
5. Step 5: Solve for x
   x = 402,949,301.50/22,140.32
6. Step 6: Final answer
   x = 18,199.80