Finding the Fourth Proportional to 10,139.29, 13,992.62 and 5,890.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.29 : 13,992.62 = 5,890.30 : x
2. Step 2: Convert to fraction form
   10,139.29/13,992.62 = 5,890.30/x
3. Step 3: Cross multiply
   10,139.29x = 13,992.62 × 5,890.30
4. Step 4: Simplify right side
   10,139.29x = 82,420,665.15
5. Step 5: Solve for x
   x = 82,420,665.15/10,139.29
6. Step 6: Final answer
   x = 8,128.84