Finding the Fourth Proportional to 2,838.60, 4,258.17 and 890.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,838.60 : 4,258.17 = 890.78 : x
2. Step 2: Convert to fraction form
   2,838.60/4,258.17 = 890.78/x
3. Step 3: Cross multiply
   2,838.60x = 4,258.17 × 890.78
4. Step 4: Simplify right side
   2,838.60x = 3,793,071.38
5. Step 5: Solve for x
   x = 3,793,071.38/2,838.60
6. Step 6: Final answer
   x = 1,336.25