Finding the Fourth Proportional to 2,087.98, 3,132.72 and 771.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.98 : 3,132.72 = 771.76 : x
2. Step 2: Convert to fraction form
   2,087.98/3,132.72 = 771.76/x
3. Step 3: Cross multiply
   2,087.98x = 3,132.72 × 771.76
4. Step 4: Simplify right side
   2,087.98x = 2,417,707.99
5. Step 5: Solve for x
   x = 2,417,707.99/2,087.98
6. Step 6: Final answer
   x = 1,157.92