Finding the Fourth Proportional to 1,061.78, 1,593.18 and 548.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.78 : 1,593.18 = 548.78 : x
2. Step 2: Convert to fraction form
   1,061.78/1,593.18 = 548.78/x
3. Step 3: Cross multiply
   1,061.78x = 1,593.18 × 548.78
4. Step 4: Simplify right side
   1,061.78x = 874,305.32
5. Step 5: Solve for x
   x = 874,305.32/1,061.78
6. Step 6: Final answer
   x = 823.43