Finding the Fourth Proportional to 32,973.60, 45,456.72 and 20,391.20

Step by Step Solution

1. Step 1: Write the proportion equation
   32,973.60 : 45,456.72 = 20,391.20 : x
2. Step 2: Convert to fraction form
   32,973.60/45,456.72 = 20,391.20/x
3. Step 3: Cross multiply
   32,973.60x = 45,456.72 × 20,391.20
4. Step 4: Simplify right side
   32,973.60x = 926,917,068.86
5. Step 5: Solve for x
   x = 926,917,068.86/32,973.60
6. Step 6: Final answer
   x = 28,110.88