Finding the Fourth Proportional to 1,858.78, 2,785.15 and 981.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.78 : 2,785.15 = 981.23 : x
2. Step 2: Convert to fraction form
   1,858.78/2,785.15 = 981.23/x
3. Step 3: Cross multiply
   1,858.78x = 2,785.15 × 981.23
4. Step 4: Simplify right side
   1,858.78x = 2,732,867.83
5. Step 5: Solve for x
   x = 2,732,867.83/1,858.78
6. Step 6: Final answer
   x = 1,470.25