Finding the Fourth Proportional to 1,073.20, 1,609.98 and 525.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,073.20 : 1,609.98 = 525.31 : x
2. Step 2: Convert to fraction form
   1,073.20/1,609.98 = 525.31/x
3. Step 3: Cross multiply
   1,073.20x = 1,609.98 × 525.31
4. Step 4: Simplify right side
   1,073.20x = 845,738.59
5. Step 5: Solve for x
   x = 845,738.59/1,073.20
6. Step 6: Final answer
   x = 788.05