Finding the Fourth Proportional to 2,073.80, 3,112.71 and 978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.80 : 3,112.71 = 978.92 : x
2. Step 2: Convert to fraction form
   2,073.80/3,112.71 = 978.92/x
3. Step 3: Cross multiply
   2,073.80x = 3,112.71 × 978.92
4. Step 4: Simplify right side
   2,073.80x = 3,047,094.07
5. Step 5: Solve for x
   x = 3,047,094.07/2,073.80
6. Step 6: Final answer
   x = 1,469.33