Finding the Fourth Proportional to 1,118.34, 1,543.39 and 646.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.34 : 1,543.39 = 646.25 : x
2. Step 2: Convert to fraction form
   1,118.34/1,543.39 = 646.25/x
3. Step 3: Cross multiply
   1,118.34x = 1,543.39 × 646.25
4. Step 4: Simplify right side
   1,118.34x = 997,406.45
5. Step 5: Solve for x
   x = 997,406.45/1,118.34
6. Step 6: Final answer
   x = 891.86