Finding the Fourth Proportional to 1,111.10, 1,665.30 and 822.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.10 : 1,665.30 = 822.20 : x
2. Step 2: Convert to fraction form
   1,111.10/1,665.30 = 822.20/x
3. Step 3: Cross multiply
   1,111.10x = 1,665.30 × 822.20
4. Step 4: Simplify right side
   1,111.10x = 1,369,209.66
5. Step 5: Solve for x
   x = 1,369,209.66/1,111.10
6. Step 6: Final answer
   x = 1,232.30