Finding the Fourth Proportional to 2,128.78, 3,193.73 and 742.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.78 : 3,193.73 = 742.16 : x
2. Step 2: Convert to fraction form
   2,128.78/3,193.73 = 742.16/x
3. Step 3: Cross multiply
   2,128.78x = 3,193.73 × 742.16
4. Step 4: Simplify right side
   2,128.78x = 2,370,265.71
5. Step 5: Solve for x
   x = 2,370,265.71/2,128.78
6. Step 6: Final answer
   x = 1,113.44