Finding the Fourth Proportional to 1,001.31, 1,381.82 and 559.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,001.31 : 1,381.82 = 559.23 : x
2. Step 2: Convert to fraction form
   1,001.31/1,381.82 = 559.23/x
3. Step 3: Cross multiply
   1,001.31x = 1,381.82 × 559.23
4. Step 4: Simplify right side
   1,001.31x = 772,752.40
5. Step 5: Solve for x
   x = 772,752.40/1,001.31
6. Step 6: Final answer
   x = 771.74