Finding the Fourth Proportional to 2,221.42, 3,061.97 and 1,688.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.42 : 3,061.97 = 1,688.53 : x
2. Step 2: Convert to fraction form
   2,221.42/3,061.97 = 1,688.53/x
3. Step 3: Cross multiply
   2,221.42x = 3,061.97 × 1,688.53
4. Step 4: Simplify right side
   2,221.42x = 5,170,219.76
5. Step 5: Solve for x
   x = 5,170,219.76/2,221.42
6. Step 6: Final answer
   x = 2,327.44