Finding the Fourth Proportional to 2,411.80, 3,617.72 and 931.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.80 : 3,617.72 = 931.74 : x
2. Step 2: Convert to fraction form
   2,411.80/3,617.72 = 931.74/x
3. Step 3: Cross multiply
   2,411.80x = 3,617.72 × 931.74
4. Step 4: Simplify right side
   2,411.80x = 3,370,774.43
5. Step 5: Solve for x
   x = 3,370,774.43/2,411.80
6. Step 6: Final answer
   x = 1,397.62