Finding the Fourth Proportional to 2,074.53, 3,111.99 and 978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.53 : 3,111.99 = 978.60 : x
2. Step 2: Convert to fraction form
   2,074.53/3,111.99 = 978.60/x
3. Step 3: Cross multiply
   2,074.53x = 3,111.99 × 978.60
4. Step 4: Simplify right side
   2,074.53x = 3,045,393.41
5. Step 5: Solve for x
   x = 3,045,393.41/2,074.53
6. Step 6: Final answer
   x = 1,467.99