Finding the Fourth Proportional to 1,022.47, 1,411.03 and 556.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.47 : 1,411.03 = 556.72 : x
2. Step 2: Convert to fraction form
   1,022.47/1,411.03 = 556.72/x
3. Step 3: Cross multiply
   1,022.47x = 1,411.03 × 556.72
4. Step 4: Simplify right side
   1,022.47x = 785,545.84
5. Step 5: Solve for x
   x = 785,545.84/1,022.47
6. Step 6: Final answer
   x = 768.28