Finding the Fourth Proportional to 1,536.72, 2,121.18 and 1,222.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,536.72 : 2,121.18 = 1,222.56 : x
2. Step 2: Convert to fraction form
   1,536.72/2,121.18 = 1,222.56/x
3. Step 3: Cross multiply
   1,536.72x = 2,121.18 × 1,222.56
4. Step 4: Simplify right side
   1,536.72x = 2,593,269.82
5. Step 5: Solve for x
   x = 2,593,269.82/1,536.72
6. Step 6: Final answer
   x = 1,687.54