Finding the Fourth Proportional to 1,866.72, 2,794.81 and 987.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866.72 : 2,794.81 = 987.23 : x
2. Step 2: Convert to fraction form
   1,866.72/2,794.81 = 987.23/x
3. Step 3: Cross multiply
   1,866.72x = 2,794.81 × 987.23
4. Step 4: Simplify right side
   1,866.72x = 2,759,103.83
5. Step 5: Solve for x
   x = 2,759,103.83/1,866.72
6. Step 6: Final answer
   x = 1,478.05