Finding the Fourth Proportional to 1,162.42, 1,742.79 and 545.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.42 : 1,742.79 = 545.78 : x
2. Step 2: Convert to fraction form
   1,162.42/1,742.79 = 545.78/x
3. Step 3: Cross multiply
   1,162.42x = 1,742.79 × 545.78
4. Step 4: Simplify right side
   1,162.42x = 951,182.04
5. Step 5: Solve for x
   x = 951,182.04/1,162.42
6. Step 6: Final answer
   x = 818.28