Finding the Fourth Proportional to 1,022.31, 1,410.80 and 556.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.31 : 1,410.80 = 556.56 : x
2. Step 2: Convert to fraction form
   1,022.31/1,410.80 = 556.56/x
3. Step 3: Cross multiply
   1,022.31x = 1,410.80 × 556.56
4. Step 4: Simplify right side
   1,022.31x = 785,192.07
5. Step 5: Solve for x
   x = 785,192.07/1,022.31
6. Step 6: Final answer
   x = 768.06