Finding the Fourth Proportional to 1,801.98, 2,486.94 and 1,005.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.98 : 2,486.94 = 1,005.60 : x
2. Step 2: Convert to fraction form
   1,801.98/2,486.94 = 1,005.60/x
3. Step 3: Cross multiply
   1,801.98x = 2,486.94 × 1,005.60
4. Step 4: Simplify right side
   1,801.98x = 2,500,866.86
5. Step 5: Solve for x
   x = 2,500,866.86/1,801.98
6. Step 6: Final answer
   x = 1,387.84