Finding the Fourth Proportional to 10,139.02, 13,990.47 and 5,662.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.02 : 13,990.47 = 5,662.20 : x
2. Step 2: Convert to fraction form
   10,139.02/13,990.47 = 5,662.20/x
3. Step 3: Cross multiply
   10,139.02x = 13,990.47 × 5,662.20
4. Step 4: Simplify right side
   10,139.02x = 79,216,839.23
5. Step 5: Solve for x
   x = 79,216,839.23/10,139.02
6. Step 6: Final answer
   x = 7,813.07