Finding the Fourth Proportional to 22,128.95, 30,538.17 and 12,057.55

Step by Step Solution

1. Step 1: Write the proportion equation
   22,128.95 : 30,538.17 = 12,057.55 : x
2. Step 2: Convert to fraction form
   22,128.95/30,538.17 = 12,057.55/x
3. Step 3: Cross multiply
   22,128.95x = 30,538.17 × 12,057.55
4. Step 4: Simplify right side
   22,128.95x = 368,215,607.12
5. Step 5: Solve for x
   x = 368,215,607.12/22,128.95
6. Step 6: Final answer
   x = 16,639.54