Finding the Fourth Proportional to 1,270.86, 1,904.06 and 978.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,270.86 : 1,904.06 = 978.06 : x
2. Step 2: Convert to fraction form
   1,270.86/1,904.06 = 978.06/x
3. Step 3: Cross multiply
   1,270.86x = 1,904.06 × 978.06
4. Step 4: Simplify right side
   1,270.86x = 1,862,284.92
5. Step 5: Solve for x
   x = 1,862,284.92/1,270.86
6. Step 6: Final answer
   x = 1,465.37