Finding the Fourth Proportional to 1,785.78, 2,461.05 and 1,287.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,785.78 : 2,461.05 = 1,287.54 : x
2. Step 2: Convert to fraction form
   1,785.78/2,461.05 = 1,287.54/x
3. Step 3: Cross multiply
   1,785.78x = 2,461.05 × 1,287.54
4. Step 4: Simplify right side
   1,785.78x = 3,168,700.32
5. Step 5: Solve for x
   x = 3,168,700.32/1,785.78
6. Step 6: Final answer
   x = 1,774.41