Finding the Fourth Proportional to 1,260.39, 1,890.72 and 530.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,260.39 : 1,890.72 = 530.31 : x
2. Step 2: Convert to fraction form
   1,260.39/1,890.72 = 530.31/x
3. Step 3: Cross multiply
   1,260.39x = 1,890.72 × 530.31
4. Step 4: Simplify right side
   1,260.39x = 1,002,667.72
5. Step 5: Solve for x
   x = 1,002,667.72/1,260.39
6. Step 6: Final answer
   x = 795.52