Finding the Fourth Proportional to 1,118.07, 1,543.15 and 646.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.07 : 1,543.15 = 646.25 : x
2. Step 2: Convert to fraction form
   1,118.07/1,543.15 = 646.25/x
3. Step 3: Cross multiply
   1,118.07x = 1,543.15 × 646.25
4. Step 4: Simplify right side
   1,118.07x = 997,253.78
5. Step 5: Solve for x
   x = 997,253.78/1,118.07
6. Step 6: Final answer
   x = 891.94