Finding the Fourth Proportional to 1,487.91, 2,053.58 and 928.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.91 : 2,053.58 = 928.61 : x
2. Step 2: Convert to fraction form
   1,487.91/2,053.58 = 928.61/x
3. Step 3: Cross multiply
   1,487.91x = 2,053.58 × 928.61
4. Step 4: Simplify right side
   1,487.91x = 1,906,960.01
5. Step 5: Solve for x
   x = 1,906,960.01/1,487.91
6. Step 6: Final answer
   x = 1,281.64