Finding the Fourth Proportional to 2,156.38, 3,230.09 and 1,372.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.38 : 3,230.09 = 1,372.50 : x
2. Step 2: Convert to fraction form
   2,156.38/3,230.09 = 1,372.50/x
3. Step 3: Cross multiply
   2,156.38x = 3,230.09 × 1,372.50
4. Step 4: Simplify right side
   2,156.38x = 4,433,306.60
5. Step 5: Solve for x
   x = 4,433,306.60/2,156.38
6. Step 6: Final answer
   x = 2,055.90