Finding the Fourth Proportional to 1,978.36, 2,967.79 and 1,276.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.36 : 2,967.79 = 1,276.12 : x
2. Step 2: Convert to fraction form
   1,978.36/2,967.79 = 1,276.12/x
3. Step 3: Cross multiply
   1,978.36x = 2,967.79 × 1,276.12
4. Step 4: Simplify right side
   1,978.36x = 3,787,256.17
5. Step 5: Solve for x
   x = 3,787,256.17/1,978.36
6. Step 6: Final answer
   x = 1,914.34