Finding the Fourth Proportional to 1,488.14, 2,053.86 and 928.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.14 : 2,053.86 = 928.70 : x
2. Step 2: Convert to fraction form
   1,488.14/2,053.86 = 928.70/x
3. Step 3: Cross multiply
   1,488.14x = 2,053.86 × 928.70
4. Step 4: Simplify right side
   1,488.14x = 1,907,419.78
5. Step 5: Solve for x
   x = 1,907,419.78/1,488.14
6. Step 6: Final answer
   x = 1,281.75