Finding the Fourth Proportional to 2,074.86, 3,110.77 and 978.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.86 : 3,110.77 = 978.61 : x
2. Step 2: Convert to fraction form
   2,074.86/3,110.77 = 978.61/x
3. Step 3: Cross multiply
   2,074.86x = 3,110.77 × 978.61
4. Step 4: Simplify right side
   2,074.86x = 3,044,230.63
5. Step 5: Solve for x
   x = 3,044,230.63/2,074.86
6. Step 6: Final answer
   x = 1,467.20