Finding the Fourth Proportional to 5,155.77, 7,737.37 and 3,988.63

Step by Step Solution

1. Step 1: Write the proportion equation
   5,155.77 : 7,737.37 = 3,988.63 : x
2. Step 2: Convert to fraction form
   5,155.77/7,737.37 = 3,988.63/x
3. Step 3: Cross multiply
   5,155.77x = 7,737.37 × 3,988.63
4. Step 4: Simplify right side
   5,155.77x = 30,861,506.10
5. Step 5: Solve for x
   x = 30,861,506.10/5,155.77
6. Step 6: Final answer
   x = 5,985.82