Finding the Fourth Proportional to 1,064.07, 1,595.86 and 405.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.07 : 1,595.86 = 405.72 : x
2. Step 2: Convert to fraction form
   1,064.07/1,595.86 = 405.72/x
3. Step 3: Cross multiply
   1,064.07x = 1,595.86 × 405.72
4. Step 4: Simplify right side
   1,064.07x = 647,466.30
5. Step 5: Solve for x
   x = 647,466.30/1,064.07
6. Step 6: Final answer
   x = 608.48