Finding the Fourth Proportional to 5,377.86, 7,411.71 and 3,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,377.86 : 7,411.71 = 3,978.18 : x
2. Step 2: Convert to fraction form
   5,377.86/7,411.71 = 3,978.18/x
3. Step 3: Cross multiply
   5,377.86x = 7,411.71 × 3,978.18
4. Step 4: Simplify right side
   5,377.86x = 29,485,116.49
5. Step 5: Solve for x
   x = 29,485,116.49/5,377.86
6. Step 6: Final answer
   x = 5,482.69