Finding the Fourth Proportional to 1,259.31, 1,889.37 and 528.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.31 : 1,889.37 = 528.69 : x
2. Step 2: Convert to fraction form
   1,259.31/1,889.37 = 528.69/x
3. Step 3: Cross multiply
   1,259.31x = 1,889.37 × 528.69
4. Step 4: Simplify right side
   1,259.31x = 998,891.03
5. Step 5: Solve for x
   x = 998,891.03/1,259.31
6. Step 6: Final answer
   x = 793.21