Finding the Fourth Proportional to 28,061.16, 38,724.12 and 16,128.24

Step by Step Solution

1. Step 1: Write the proportion equation
   28,061.16 : 38,724.12 = 16,128.24 : x
2. Step 2: Convert to fraction form
   28,061.16/38,724.12 = 16,128.24/x
3. Step 3: Cross multiply
   28,061.16x = 38,724.12 × 16,128.24
4. Step 4: Simplify right side
   28,061.16x = 624,551,901.15
5. Step 5: Solve for x
   x = 624,551,901.15/28,061.16
6. Step 6: Final answer
   x = 22,256.81