Finding the Fourth Proportional to 1,000.34, 1,380.33 and 580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,000.34 : 1,380.33 = 580.72 : x
2. Step 2: Convert to fraction form
   1,000.34/1,380.33 = 580.72/x
3. Step 3: Cross multiply
   1,000.34x = 1,380.33 × 580.72
4. Step 4: Simplify right side
   1,000.34x = 801,585.24
5. Step 5: Solve for x
   x = 801,585.24/1,000.34
6. Step 6: Final answer
   x = 801.31