Finding the Fourth Proportional to 13,308.74, 18,366.03 and 7,643.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.74 : 18,366.03 = 7,643.86 : x
2. Step 2: Convert to fraction form
   13,308.74/18,366.03 = 7,643.86/x
3. Step 3: Cross multiply
   13,308.74x = 18,366.03 × 7,643.86
4. Step 4: Simplify right side
   13,308.74x = 140,387,273.54
5. Step 5: Solve for x
   x = 140,387,273.54/13,308.74
6. Step 6: Final answer
   x = 10,548.50