Finding the Fourth Proportional to 2,953.78, 4,431.05 and 978.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,953.78 : 4,431.05 = 978.73 : x
2. Step 2: Convert to fraction form
   2,953.78/4,431.05 = 978.73/x
3. Step 3: Cross multiply
   2,953.78x = 4,431.05 × 978.73
4. Step 4: Simplify right side
   2,953.78x = 4,336,801.57
5. Step 5: Solve for x
   x = 4,336,801.57/2,953.78
6. Step 6: Final answer
   x = 1,468.22