Finding the Fourth Proportional to 2,073.60, 3,111.75 and 978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.60 : 3,111.75 = 978.30 : x
2. Step 2: Convert to fraction form
   2,073.60/3,111.75 = 978.30/x
3. Step 3: Cross multiply
   2,073.60x = 3,111.75 × 978.30
4. Step 4: Simplify right side
   2,073.60x = 3,044,225.03
5. Step 5: Solve for x
   x = 3,044,225.03/2,073.60
6. Step 6: Final answer
   x = 1,468.09