Finding the Fourth Proportional to 10,139.49, 13,992.42 and 5,602.45

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.49 : 13,992.42 = 5,602.45 : x
2. Step 2: Convert to fraction form
   10,139.49/13,992.42 = 5,602.45/x
3. Step 3: Cross multiply
   10,139.49x = 13,992.42 × 5,602.45
4. Step 4: Simplify right side
   10,139.49x = 78,391,829.94
5. Step 5: Solve for x
   x = 78,391,829.94/10,139.49
6. Step 6: Final answer
   x = 7,731.34