Finding the Fourth Proportional to 2,092.86, 3,139.38 and 938.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,092.86 : 3,139.38 = 938.64 : x
2. Step 2: Convert to fraction form
   2,092.86/3,139.38 = 938.64/x
3. Step 3: Cross multiply
   2,092.86x = 3,139.38 × 938.64
4. Step 4: Simplify right side
   2,092.86x = 2,946,747.64
5. Step 5: Solve for x
   x = 2,946,747.64/2,092.86
6. Step 6: Final answer
   x = 1,408.00