Finding the Fourth Proportional to 2,071.43, 3,107.15 and 772.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.43 : 3,107.15 = 772.88 : x
2. Step 2: Convert to fraction form
   2,071.43/3,107.15 = 772.88/x
3. Step 3: Cross multiply
   2,071.43x = 3,107.15 × 772.88
4. Step 4: Simplify right side
   2,071.43x = 2,401,434.69
5. Step 5: Solve for x
   x = 2,401,434.69/2,071.43
6. Step 6: Final answer
   x = 1,159.32