Finding the Fourth Proportional to 21,930.50, 32,900.96 and 7,139.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,930.50 : 32,900.96 = 7,139.43 : x
2. Step 2: Convert to fraction form
   21,930.50/32,900.96 = 7,139.43/x
3. Step 3: Cross multiply
   21,930.50x = 32,900.96 × 7,139.43
4. Step 4: Simplify right side
   21,930.50x = 234,894,118.70
5. Step 5: Solve for x
   x = 234,894,118.70/21,930.50
6. Step 6: Final answer
   x = 10,710.84