Finding the Fourth Proportional to 13,380.05, 18,462.72 and 7,715.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.05 : 18,462.72 = 7,715.01 : x
2. Step 2: Convert to fraction form
   13,380.05/18,462.72 = 7,715.01/x
3. Step 3: Cross multiply
   13,380.05x = 18,462.72 × 7,715.01
4. Step 4: Simplify right side
   13,380.05x = 142,440,069.43
5. Step 5: Solve for x
   x = 142,440,069.43/13,380.05
6. Step 6: Final answer
   x = 10,645.71