Finding the Fourth Proportional to 10,131.57, 13,992.35 and 7,715.70

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131.57 : 13,992.35 = 7,715.70 : x
2. Step 2: Convert to fraction form
   10,131.57/13,992.35 = 7,715.70/x
3. Step 3: Cross multiply
   10,131.57x = 13,992.35 × 7,715.70
4. Step 4: Simplify right side
   10,131.57x = 107,960,736.32
5. Step 5: Solve for x
   x = 107,960,736.32/10,131.57
6. Step 6: Final answer
   x = 10,655.87