Finding the Fourth Proportional to 10,138.89, 13,990.07 and 5,662.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,138.89 : 13,990.07 = 5,662.43 : x
2. Step 2: Convert to fraction form
   10,138.89/13,990.07 = 5,662.43/x
3. Step 3: Cross multiply
   10,138.89x = 13,990.07 × 5,662.43
4. Step 4: Simplify right side
   10,138.89x = 79,217,693.81
5. Step 5: Solve for x
   x = 79,217,693.81/10,138.89
6. Step 6: Final answer
   x = 7,813.25