Finding the Fourth Proportional to 21,930.18, 32,895.57 and 7,139.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,930.18 : 32,895.57 = 7,139.17 : x
2. Step 2: Convert to fraction form
   21,930.18/32,895.57 = 7,139.17/x
3. Step 3: Cross multiply
   21,930.18x = 32,895.57 × 7,139.17
4. Step 4: Simplify right side
   21,930.18x = 234,847,066.48
5. Step 5: Solve for x
   x = 234,847,066.48/21,930.18
6. Step 6: Final answer
   x = 10,708.85