Finding the Fourth Proportional to 21,910.88, 32,870.92 and 7,120.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,910.88 : 32,870.92 = 7,120.16 : x
2. Step 2: Convert to fraction form
   21,910.88/32,870.92 = 7,120.16/x
3. Step 3: Cross multiply
   21,910.88x = 32,870.92 × 7,120.16
4. Step 4: Simplify right side
   21,910.88x = 234,046,209.75
5. Step 5: Solve for x
   x = 234,046,209.75/21,910.88
6. Step 6: Final answer
   x = 10,681.73