Finding the Fourth Proportional to 13,499.10, 18,621.27 and 7,909.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,499.10 : 18,621.27 = 7,909.02 : x
2. Step 2: Convert to fraction form
   13,499.10/18,621.27 = 7,909.02/x
3. Step 3: Cross multiply
   13,499.10x = 18,621.27 × 7,909.02
4. Step 4: Simplify right side
   13,499.10x = 147,275,996.86
5. Step 5: Solve for x
   x = 147,275,996.86/13,499.10
6. Step 6: Final answer
   x = 10,910.06