Finding the Fourth Proportional to 1,112.13, 1,667.18 and 678.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.13 : 1,667.18 = 678.38 : x
2. Step 2: Convert to fraction form
   1,112.13/1,667.18 = 678.38/x
3. Step 3: Cross multiply
   1,112.13x = 1,667.18 × 678.38
4. Step 4: Simplify right side
   1,112.13x = 1,130,974.93
5. Step 5: Solve for x
   x = 1,130,974.93/1,112.13
6. Step 6: Final answer
   x = 1,016.94