Finding the Fourth Proportional to 2,978.78, 4,468.92 and 898.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.78 : 4,468.92 = 898.74 : x
2. Step 2: Convert to fraction form
   2,978.78/4,468.92 = 898.74/x
3. Step 3: Cross multiply
   2,978.78x = 4,468.92 × 898.74
4. Step 4: Simplify right side
   2,978.78x = 4,016,397.16
5. Step 5: Solve for x
   x = 4,016,397.16/2,978.78
6. Step 6: Final answer
   x = 1,348.34