Finding the Fourth Proportional to 3,977.64, 5,499.77 and 3,915.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,977.64 : 5,499.77 = 3,915.27 : x
2. Step 2: Convert to fraction form
   3,977.64/5,499.77 = 3,915.27/x
3. Step 3: Cross multiply
   3,977.64x = 5,499.77 × 3,915.27
4. Step 4: Simplify right side
   3,977.64x = 21,533,064.91
5. Step 5: Solve for x
   x = 21,533,064.91/3,977.64
6. Step 6: Final answer
   x = 5,413.53