Finding the Fourth Proportional to 1,751.31, 2,417.17 and 1,005.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,751.31 : 2,417.17 = 1,005.78 : x
2. Step 2: Convert to fraction form
   1,751.31/2,417.17 = 1,005.78/x
3. Step 3: Cross multiply
   1,751.31x = 2,417.17 × 1,005.78
4. Step 4: Simplify right side
   1,751.31x = 2,431,146.85
5. Step 5: Solve for x
   x = 2,431,146.85/1,751.31
6. Step 6: Final answer
   x = 1,388.19