Finding the Fourth Proportional to 2,117.78, 3,174.52 and 1,021.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.78 : 3,174.52 = 1,021.54 : x
2. Step 2: Convert to fraction form
   2,117.78/3,174.52 = 1,021.54/x
3. Step 3: Cross multiply
   2,117.78x = 3,174.52 × 1,021.54
4. Step 4: Simplify right side
   2,117.78x = 3,242,899.16
5. Step 5: Solve for x
   x = 3,242,899.16/2,117.78
6. Step 6: Final answer
   x = 1,531.27