Finding the Fourth Proportional to 1,001.39, 1,381.88 and 559.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,001.39 : 1,381.88 = 559.27 : x
2. Step 2: Convert to fraction form
   1,001.39/1,381.88 = 559.27/x
3. Step 3: Cross multiply
   1,001.39x = 1,381.88 × 559.27
4. Step 4: Simplify right side
   1,001.39x = 772,844.03
5. Step 5: Solve for x
   x = 772,844.03/1,001.39
6. Step 6: Final answer
   x = 771.77