Finding the Fourth Proportional to 1,013.81, 1,399.06 and 548.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.81 : 1,399.06 = 548.06 : x
2. Step 2: Convert to fraction form
   1,013.81/1,399.06 = 548.06/x
3. Step 3: Cross multiply
   1,013.81x = 1,399.06 × 548.06
4. Step 4: Simplify right side
   1,013.81x = 766,773.01
5. Step 5: Solve for x
   x = 766,773.01/1,013.81
6. Step 6: Final answer
   x = 756.33