Finding the Fourth Proportional to 2,659.79, 3,988.59 and 928.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.79 : 3,988.59 = 928.01 : x
2. Step 2: Convert to fraction form
   2,659.79/3,988.59 = 928.01/x
3. Step 3: Cross multiply
   2,659.79x = 3,988.59 × 928.01
4. Step 4: Simplify right side
   2,659.79x = 3,701,431.46
5. Step 5: Solve for x
   x = 3,701,431.46/2,659.79
6. Step 6: Final answer
   x = 1,391.63