Finding the Fourth Proportional to 2,293.79, 3,439.81 and 978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,293.79 : 3,439.81 = 978.16 : x
2. Step 2: Convert to fraction form
   2,293.79/3,439.81 = 978.16/x
3. Step 3: Cross multiply
   2,293.79x = 3,439.81 × 978.16
4. Step 4: Simplify right side
   2,293.79x = 3,364,684.55
5. Step 5: Solve for x
   x = 3,364,684.55/2,293.79
6. Step 6: Final answer
   x = 1,466.87