Finding the Fourth Proportional to 2,071.20, 3,108.01 and 772.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.20 : 3,108.01 = 772.77 : x
2. Step 2: Convert to fraction form
   2,071.20/3,108.01 = 772.77/x
3. Step 3: Cross multiply
   2,071.20x = 3,108.01 × 772.77
4. Step 4: Simplify right side
   2,071.20x = 2,401,759.42
5. Step 5: Solve for x
   x = 2,401,759.42/2,071.20
6. Step 6: Final answer
   x = 1,159.60