Finding the Fourth Proportional to 2,190.72, 3,023.40 and 1,306.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.72 : 3,023.40 = 1,306.56 : x
2. Step 2: Convert to fraction form
   2,190.72/3,023.40 = 1,306.56/x
3. Step 3: Cross multiply
   2,190.72x = 3,023.40 × 1,306.56
4. Step 4: Simplify right side
   2,190.72x = 3,950,253.50
5. Step 5: Solve for x
   x = 3,950,253.50/2,190.72
6. Step 6: Final answer
   x = 1,803.18