Finding the Fourth Proportional to 1,118.94, 1,543.82 and 646.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.94 : 1,543.82 = 646.71 : x
2. Step 2: Convert to fraction form
   1,118.94/1,543.82 = 646.71/x
3. Step 3: Cross multiply
   1,118.94x = 1,543.82 × 646.71
4. Step 4: Simplify right side
   1,118.94x = 998,400.60
5. Step 5: Solve for x
   x = 998,400.60/1,118.94
6. Step 6: Final answer
   x = 892.27