Finding the Fourth Proportional to 1,222.51, 1,843.34 and 1,120.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.51 : 1,843.34 = 1,120.45 : x
2. Step 2: Convert to fraction form
   1,222.51/1,843.34 = 1,120.45/x
3. Step 3: Cross multiply
   1,222.51x = 1,843.34 × 1,120.45
4. Step 4: Simplify right side
   1,222.51x = 2,065,370.30
5. Step 5: Solve for x
   x = 2,065,370.30/1,222.51
6. Step 6: Final answer
   x = 1,689.45