Finding the Fourth Proportional to 1,111.56, 1,663.71 and 818.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.56 : 1,663.71 = 818.94 : x
2. Step 2: Convert to fraction form
   1,111.56/1,663.71 = 818.94/x
3. Step 3: Cross multiply
   1,111.56x = 1,663.71 × 818.94
4. Step 4: Simplify right side
   1,111.56x = 1,362,478.67
5. Step 5: Solve for x
   x = 1,362,478.67/1,111.56
6. Step 6: Final answer
   x = 1,225.74