Finding the Fourth Proportional to 28,705.12, 39,612.72 and 16,132

Step by Step Solution

1. Step 1: Write the proportion equation
   28,705.12 : 39,612.72 = 16,132 : x
2. Step 2: Convert to fraction form
   28,705.12/39,612.72 = 16,132/x
3. Step 3: Cross multiply
   28,705.12x = 39,612.72 × 16,132
4. Step 4: Simplify right side
   28,705.12x = 639,032,399.04
5. Step 5: Solve for x
   x = 639,032,399.04/28,705.12
6. Step 6: Final answer
   x = 22,261.97