Finding the Fourth Proportional to 5,278.32, 7,900.31 and 3,891.10

Step by Step Solution

1. Step 1: Write the proportion equation
   5,278.32 : 7,900.31 = 3,891.10 : x
2. Step 2: Convert to fraction form
   5,278.32/7,900.31 = 3,891.10/x
3. Step 3: Cross multiply
   5,278.32x = 7,900.31 × 3,891.10
4. Step 4: Simplify right side
   5,278.32x = 30,740,896.24
5. Step 5: Solve for x
   x = 30,740,896.24/5,278.32
6. Step 6: Final answer
   x = 5,823.99