Finding the Fourth Proportional to 2,572.79, 3,858.27 and 928.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.79 : 3,858.27 = 928.89 : x
2. Step 2: Convert to fraction form
   2,572.79/3,858.27 = 928.89/x
3. Step 3: Cross multiply
   2,572.79x = 3,858.27 × 928.89
4. Step 4: Simplify right side
   2,572.79x = 3,583,904.94
5. Step 5: Solve for x
   x = 3,583,904.94/2,572.79
6. Step 6: Final answer
   x = 1,393.01