Finding the Fourth Proportional to 1,145.52, 1,580.31 and 679.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.52 : 1,580.31 = 679.50 : x
2. Step 2: Convert to fraction form
   1,145.52/1,580.31 = 679.50/x
3. Step 3: Cross multiply
   1,145.52x = 1,580.31 × 679.50
4. Step 4: Simplify right side
   1,145.52x = 1,073,820.65
5. Step 5: Solve for x
   x = 1,073,820.65/1,145.52
6. Step 6: Final answer
   x = 937.41