Finding the Fourth Proportional to 5,641.32, 8,447.38 and 3,891.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,641.32 : 8,447.38 = 3,891.72 : x
2. Step 2: Convert to fraction form
   5,641.32/8,447.38 = 3,891.72/x
3. Step 3: Cross multiply
   5,641.32x = 8,447.38 × 3,891.72
4. Step 4: Simplify right side
   5,641.32x = 32,874,837.69
5. Step 5: Solve for x
   x = 32,874,837.69/5,641.32
6. Step 6: Final answer
   x = 5,827.51