Finding the Fourth Proportional to 803.34, 1,108.71 and 488.72

Step by Step Solution

1. Step 1: Write the proportion equation
   803.34 : 1,108.71 = 488.72 : x
2. Step 2: Convert to fraction form
   803.34/1,108.71 = 488.72/x
3. Step 3: Cross multiply
   803.34x = 1,108.71 × 488.72
4. Step 4: Simplify right side
   803.34x = 541,851.52
5. Step 5: Solve for x
   x = 541,851.52/803.34
6. Step 6: Final answer
   x = 674.50