Finding the Fourth Proportional to 13,380.68, 18,462.72 and 7,790.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.68 : 18,462.72 = 7,790.60 : x
2. Step 2: Convert to fraction form
   13,380.68/18,462.72 = 7,790.60/x
3. Step 3: Cross multiply
   13,380.68x = 18,462.72 × 7,790.60
4. Step 4: Simplify right side
   13,380.68x = 143,835,666.43
5. Step 5: Solve for x
   x = 143,835,666.43/13,380.68
6. Step 6: Final answer
   x = 10,749.50