Finding the Fourth Proportional to 1,352.38, 1,867.14 and 978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,352.38 : 1,867.14 = 978.78 : x
2. Step 2: Convert to fraction form
   1,352.38/1,867.14 = 978.78/x
3. Step 3: Cross multiply
   1,352.38x = 1,867.14 × 978.78
4. Step 4: Simplify right side
   1,352.38x = 1,827,519.29
5. Step 5: Solve for x
   x = 1,827,519.29/1,352.38
6. Step 6: Final answer
   x = 1,351.34