Finding the Fourth Proportional to 1,488.41, 2,053.86 and 890.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.41 : 2,053.86 = 890.78 : x
2. Step 2: Convert to fraction form
   1,488.41/2,053.86 = 890.78/x
3. Step 3: Cross multiply
   1,488.41x = 2,053.86 × 890.78
4. Step 4: Simplify right side
   1,488.41x = 1,829,535.35
5. Step 5: Solve for x
   x = 1,829,535.35/1,488.41
6. Step 6: Final answer
   x = 1,229.19