Finding the Fourth Proportional to 1,171.78, 1,617.08 and 647.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.78 : 1,617.08 = 647.82 : x
2. Step 2: Convert to fraction form
   1,171.78/1,617.08 = 647.82/x
3. Step 3: Cross multiply
   1,171.78x = 1,617.08 × 647.82
4. Step 4: Simplify right side
   1,171.78x = 1,047,576.77
5. Step 5: Solve for x
   x = 1,047,576.77/1,171.78
6. Step 6: Final answer
   x = 894.00