Finding the Fourth Proportional to 1,864.67, 2,797.61 and 890.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864.67 : 2,797.61 = 890.78 : x
2. Step 2: Convert to fraction form
   1,864.67/2,797.61 = 890.78/x
3. Step 3: Cross multiply
   1,864.67x = 2,797.61 × 890.78
4. Step 4: Simplify right side
   1,864.67x = 2,492,036.59
5. Step 5: Solve for x
   x = 2,492,036.59/1,864.67
6. Step 6: Final answer
   x = 1,336.45