Finding the Fourth Proportional to 1,118.32, 1,543.34 and 646.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.32 : 1,543.34 = 646.22 : x
2. Step 2: Convert to fraction form
   1,118.32/1,543.34 = 646.22/x
3. Step 3: Cross multiply
   1,118.32x = 1,543.34 × 646.22
4. Step 4: Simplify right side
   1,118.32x = 997,337.17
5. Step 5: Solve for x
   x = 997,337.17/1,118.32
6. Step 6: Final answer
   x = 891.82