Finding the Fourth Proportional to 1,112.85, 1,667.25 and 1,074.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.85 : 1,667.25 = 1,074.78 : x
2. Step 2: Convert to fraction form
   1,112.85/1,667.25 = 1,074.78/x
3. Step 3: Cross multiply
   1,112.85x = 1,667.25 × 1,074.78
4. Step 4: Simplify right side
   1,112.85x = 1,791,926.96
5. Step 5: Solve for x
   x = 1,791,926.96/1,112.85
6. Step 6: Final answer
   x = 1,610.21