Finding the Fourth Proportional to 1,156.71, 1,595.78 and 708.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.71 : 1,595.78 = 708.76 : x
2. Step 2: Convert to fraction form
   1,156.71/1,595.78 = 708.76/x
3. Step 3: Cross multiply
   1,156.71x = 1,595.78 × 708.76
4. Step 4: Simplify right side
   1,156.71x = 1,131,019.66
5. Step 5: Solve for x
   x = 1,131,019.66/1,156.71
6. Step 6: Final answer
   x = 977.79