Finding the Fourth Proportional to 2,412.90, 3,619.20 and 931.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.90 : 3,619.20 = 931.83 : x
2. Step 2: Convert to fraction form
   2,412.90/3,619.20 = 931.83/x
3. Step 3: Cross multiply
   2,412.90x = 3,619.20 × 931.83
4. Step 4: Simplify right side
   2,412.90x = 3,372,472.42
5. Step 5: Solve for x
   x = 3,372,472.42/2,412.90
6. Step 6: Final answer
   x = 1,397.69