Finding the Fourth Proportional to 1,112.34, 1,665.27 and 678.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.34 : 1,665.27 = 678.18 : x
2. Step 2: Convert to fraction form
   1,112.34/1,665.27 = 678.18/x
3. Step 3: Cross multiply
   1,112.34x = 1,665.27 × 678.18
4. Step 4: Simplify right side
   1,112.34x = 1,129,352.81
5. Step 5: Solve for x
   x = 1,129,352.81/1,112.34
6. Step 6: Final answer
   x = 1,015.29