Finding the Fourth Proportional to 1,240.62, 1,711.71 and 977.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.62 : 1,711.71 = 977.82 : x
2. Step 2: Convert to fraction form
   1,240.62/1,711.71 = 977.82/x
3. Step 3: Cross multiply
   1,240.62x = 1,711.71 × 977.82
4. Step 4: Simplify right side
   1,240.62x = 1,673,744.27
5. Step 5: Solve for x
   x = 1,673,744.27/1,240.62
6. Step 6: Final answer
   x = 1,349.12