Finding the Fourth Proportional to 13,648.32, 20,471.55 and 5,326.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,648.32 : 20,471.55 = 5,326.79 : x
2. Step 2: Convert to fraction form
   13,648.32/20,471.55 = 5,326.79/x
3. Step 3: Cross multiply
   13,648.32x = 20,471.55 × 5,326.79
4. Step 4: Simplify right side
   13,648.32x = 109,047,545.47
5. Step 5: Solve for x
   x = 109,047,545.47/13,648.32
6. Step 6: Final answer
   x = 7,989.81