Finding the Fourth Proportional to 1,915.57, 2,873.31 and 990.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.57 : 2,873.31 = 990.82 : x
2. Step 2: Convert to fraction form
   1,915.57/2,873.31 = 990.82/x
3. Step 3: Cross multiply
   1,915.57x = 2,873.31 × 990.82
4. Step 4: Simplify right side
   1,915.57x = 2,846,933.01
5. Step 5: Solve for x
   x = 2,846,933.01/1,915.57
6. Step 6: Final answer
   x = 1,486.21