Finding the Fourth Proportional to 1,242.89, 1,854.18 and 1,154.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.89 : 1,854.18 = 1,154.51 : x
2. Step 2: Convert to fraction form
   1,242.89/1,854.18 = 1,154.51/x
3. Step 3: Cross multiply
   1,242.89x = 1,854.18 × 1,154.51
4. Step 4: Simplify right side
   1,242.89x = 2,140,669.35
5. Step 5: Solve for x
   x = 2,140,669.35/1,242.89
6. Step 6: Final answer
   x = 1,722.33