Finding the Fourth Proportional to 1,905.68, 2,854.04 and 928.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,905.68 : 2,854.04 = 928.72 : x
2. Step 2: Convert to fraction form
   1,905.68/2,854.04 = 928.72/x
3. Step 3: Cross multiply
   1,905.68x = 2,854.04 × 928.72
4. Step 4: Simplify right side
   1,905.68x = 2,650,604.03
5. Step 5: Solve for x
   x = 2,650,604.03/1,905.68
6. Step 6: Final answer
   x = 1,390.90