Finding the Fourth Proportional to 2,659.95, 3,991.73 and 928.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.95 : 3,991.73 = 928.57 : x
2. Step 2: Convert to fraction form
   2,659.95/3,991.73 = 928.57/x
3. Step 3: Cross multiply
   2,659.95x = 3,991.73 × 928.57
4. Step 4: Simplify right side
   2,659.95x = 3,706,603.05
5. Step 5: Solve for x
   x = 3,706,603.05/2,659.95
6. Step 6: Final answer
   x = 1,393.49