Finding the Fourth Proportional to 1,111.06, 1,662.98 and 818.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.06 : 1,662.98 = 818.45 : x
2. Step 2: Convert to fraction form
   1,111.06/1,662.98 = 818.45/x
3. Step 3: Cross multiply
   1,111.06x = 1,662.98 × 818.45
4. Step 4: Simplify right side
   1,111.06x = 1,361,056.69
5. Step 5: Solve for x
   x = 1,361,056.69/1,111.06
6. Step 6: Final answer
   x = 1,225.01