Finding the Fourth Proportional to 2,827.56, 4,242.38 and 978.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,827.56 : 4,242.38 = 978.87 : x
2. Step 2: Convert to fraction form
   2,827.56/4,242.38 = 978.87/x
3. Step 3: Cross multiply
   2,827.56x = 4,242.38 × 978.87
4. Step 4: Simplify right side
   2,827.56x = 4,152,733.62
5. Step 5: Solve for x
   x = 4,152,733.62/2,827.56
6. Step 6: Final answer
   x = 1,468.66