Finding the Fourth Proportional to 21,920.32, 32,877.37 and 7,129.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,920.32 : 32,877.37 = 7,129.45 : x
2. Step 2: Convert to fraction form
   21,920.32/32,877.37 = 7,129.45/x
3. Step 3: Cross multiply
   21,920.32x = 32,877.37 × 7,129.45
4. Step 4: Simplify right side
   21,920.32x = 234,397,565.55
5. Step 5: Solve for x
   x = 234,397,565.55/21,920.32
6. Step 6: Final answer
   x = 10,693.16