Finding the Fourth Proportional to 10,139.96, 13,992.90 and 5,663.54

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.96 : 13,992.90 = 5,663.54 : x
2. Step 2: Convert to fraction form
   10,139.96/13,992.90 = 5,663.54/x
3. Step 3: Cross multiply
   10,139.96x = 13,992.90 × 5,663.54
4. Step 4: Simplify right side
   10,139.96x = 79,249,348.87
5. Step 5: Solve for x
   x = 79,249,348.87/10,139.96
6. Step 6: Final answer
   x = 7,815.55