Finding the Fourth Proportional to 1,105.42, 1,656.98 and 812.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.42 : 1,656.98 = 812.49 : x
2. Step 2: Convert to fraction form
   1,105.42/1,656.98 = 812.49/x
3. Step 3: Cross multiply
   1,105.42x = 1,656.98 × 812.49
4. Step 4: Simplify right side
   1,105.42x = 1,346,279.68
5. Step 5: Solve for x
   x = 1,346,279.68/1,105.42
6. Step 6: Final answer
   x = 1,217.89