Finding the Fourth Proportional to 2,157.86, 3,233.70 and 1,231.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.86 : 3,233.70 = 1,231.50 : x
2. Step 2: Convert to fraction form
   2,157.86/3,233.70 = 1,231.50/x
3. Step 3: Cross multiply
   2,157.86x = 3,233.70 × 1,231.50
4. Step 4: Simplify right side
   2,157.86x = 3,982,301.55
5. Step 5: Solve for x
   x = 3,982,301.55/2,157.86
6. Step 6: Final answer
   x = 1,845.49