Finding the Fourth Proportional to 1,800.78, 2,485.02 and 1,004.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,800.78 : 2,485.02 = 1,004.10 : x
2. Step 2: Convert to fraction form
   1,800.78/2,485.02 = 1,004.10/x
3. Step 3: Cross multiply
   1,800.78x = 2,485.02 × 1,004.10
4. Step 4: Simplify right side
   1,800.78x = 2,495,208.58
5. Step 5: Solve for x
   x = 2,495,208.58/1,800.78
6. Step 6: Final answer
   x = 1,385.63