Finding the Fourth Proportional to 10,139.97, 13,989.18 and 5,890.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.97 : 13,989.18 = 5,890.30 : x
2. Step 2: Convert to fraction form
   10,139.97/13,989.18 = 5,890.30/x
3. Step 3: Cross multiply
   10,139.97x = 13,989.18 × 5,890.30
4. Step 4: Simplify right side
   10,139.97x = 82,400,466.95
5. Step 5: Solve for x
   x = 82,400,466.95/10,139.97
6. Step 6: Final answer
   x = 8,126.30