Finding the Fourth Proportional to 1,856.27, 2,785.01 and 990.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.27 : 2,785.01 = 990.38 : x
2. Step 2: Convert to fraction form
   1,856.27/2,785.01 = 990.38/x
3. Step 3: Cross multiply
   1,856.27x = 2,785.01 × 990.38
4. Step 4: Simplify right side
   1,856.27x = 2,758,199.33
5. Step 5: Solve for x
   x = 2,758,199.33/1,856.27
6. Step 6: Final answer
   x = 1,485.89