Finding the Fourth Proportional to 5,865.78, 8,091.72 and 3,873.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,865.78 : 8,091.72 = 3,873.72 : x
2. Step 2: Convert to fraction form
   5,865.78/8,091.72 = 3,873.72/x
3. Step 3: Cross multiply
   5,865.78x = 8,091.72 × 3,873.72
4. Step 4: Simplify right side
   5,865.78x = 31,345,057.60
5. Step 5: Solve for x
   x = 31,345,057.60/5,865.78
6. Step 6: Final answer
   x = 5,343.72