Finding the Fourth Proportional to 5,870.86, 8,100.15 and 3,880.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,870.86 : 8,100.15 = 3,880.78 : x
2. Step 2: Convert to fraction form
   5,870.86/8,100.15 = 3,880.78/x
3. Step 3: Cross multiply
   5,870.86x = 8,100.15 × 3,880.78
4. Step 4: Simplify right side
   5,870.86x = 31,434,900.12
5. Step 5: Solve for x
   x = 31,434,900.12/5,870.86
6. Step 6: Final answer
   x = 5,354.39