Finding the Fourth Proportional to 21,291.98, 31,942.42 and 7,250.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,291.98 : 31,942.42 = 7,250.90 : x
2. Step 2: Convert to fraction form
   21,291.98/31,942.42 = 7,250.90/x
3. Step 3: Cross multiply
   21,291.98x = 31,942.42 × 7,250.90
4. Step 4: Simplify right side
   21,291.98x = 231,611,115.34
5. Step 5: Solve for x
   x = 231,611,115.34/21,291.98
6. Step 6: Final answer
   x = 10,877.86