Finding the Fourth Proportional to 1,009.34, 1,392.71 and 928.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.34 : 1,392.71 = 928.68 : x
2. Step 2: Convert to fraction form
   1,009.34/1,392.71 = 928.68/x
3. Step 3: Cross multiply
   1,009.34x = 1,392.71 × 928.68
4. Step 4: Simplify right side
   1,009.34x = 1,293,377.28
5. Step 5: Solve for x
   x = 1,293,377.28/1,009.34
6. Step 6: Final answer
   x = 1,281.42