Finding the Fourth Proportional to 2,076.50, 3,112.68 and 978.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.50 : 3,112.68 = 978.90 : x
2. Step 2: Convert to fraction form
   2,076.50/3,112.68 = 978.90/x
3. Step 3: Cross multiply
   2,076.50x = 3,112.68 × 978.90
4. Step 4: Simplify right side
   2,076.50x = 3,047,002.45
5. Step 5: Solve for x
   x = 3,047,002.45/2,076.50
6. Step 6: Final answer
   x = 1,467.37