Finding the Fourth Proportional to 5,155.76, 7,766.06 and 5,087.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,155.76 : 7,766.06 = 5,087.72 : x
2. Step 2: Convert to fraction form
   5,155.76/7,766.06 = 5,087.72/x
3. Step 3: Cross multiply
   5,155.76x = 7,766.06 × 5,087.72
4. Step 4: Simplify right side
   5,155.76x = 39,511,538.78
5. Step 5: Solve for x
   x = 39,511,538.78/5,155.76
6. Step 6: Final answer
   x = 7,663.57