Finding the Fourth Proportional to 2,377.43, 3,565.57 and 990.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,377.43 : 3,565.57 = 990.78 : x
2. Step 2: Convert to fraction form
   2,377.43/3,565.57 = 990.78/x
3. Step 3: Cross multiply
   2,377.43x = 3,565.57 × 990.78
4. Step 4: Simplify right side
   2,377.43x = 3,532,701.51
5. Step 5: Solve for x
   x = 3,532,701.51/2,377.43
6. Step 6: Final answer
   x = 1,485.94