Finding the Fourth Proportional to 1,073.72, 1,610.72 and 415.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,073.72 : 1,610.72 = 415.58 : x
2. Step 2: Convert to fraction form
   1,073.72/1,610.72 = 415.58/x
3. Step 3: Cross multiply
   1,073.72x = 1,610.72 × 415.58
4. Step 4: Simplify right side
   1,073.72x = 669,372.89
5. Step 5: Solve for x
   x = 669,372.89/1,073.72
6. Step 6: Final answer
   x = 623.42