Finding the Fourth Proportional to 2,690.78, 4,035.69 and 742.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,690.78 : 4,035.69 = 742.55 : x
2. Step 2: Convert to fraction form
   2,690.78/4,035.69 = 742.55/x
3. Step 3: Cross multiply
   2,690.78x = 4,035.69 × 742.55
4. Step 4: Simplify right side
   2,690.78x = 2,996,681.43
5. Step 5: Solve for x
   x = 2,996,681.43/2,690.78
6. Step 6: Final answer
   x = 1,113.69