Finding the Fourth Proportional to 1,222.74, 1,687.76 and 1,058.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.74 : 1,687.76 = 1,058.72 : x
2. Step 2: Convert to fraction form
   1,222.74/1,687.76 = 1,058.72/x
3. Step 3: Cross multiply
   1,222.74x = 1,687.76 × 1,058.72
4. Step 4: Simplify right side
   1,222.74x = 1,786,851.53
5. Step 5: Solve for x
   x = 1,786,851.53/1,222.74
6. Step 6: Final answer
   x = 1,461.35