Finding the Fourth Proportional to 2,157.90, 3,232.71 and 1,230.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.90 : 3,232.71 = 1,230.72 : x
2. Step 2: Convert to fraction form
   2,157.90/3,232.71 = 1,230.72/x
3. Step 3: Cross multiply
   2,157.90x = 3,232.71 × 1,230.72
4. Step 4: Simplify right side
   2,157.90x = 3,978,560.85
5. Step 5: Solve for x
   x = 3,978,560.85/2,157.90
6. Step 6: Final answer
   x = 1,843.72