Finding the Fourth Proportional to 1,022.30, 1,410.76 and 556.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.30 : 1,410.76 = 556.55 : x
2. Step 2: Convert to fraction form
   1,022.30/1,410.76 = 556.55/x
3. Step 3: Cross multiply
   1,022.30x = 1,410.76 × 556.55
4. Step 4: Simplify right side
   1,022.30x = 785,158.48
5. Step 5: Solve for x
   x = 785,158.48/1,022.30
6. Step 6: Final answer
   x = 768.03