Finding the Fourth Proportional to 1,055.00, 1,581.59 and 405.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.00 : 1,581.59 = 405.29 : x
2. Step 2: Convert to fraction form
   1,055.00/1,581.59 = 405.29/x
3. Step 3: Cross multiply
   1,055.00x = 1,581.59 × 405.29
4. Step 4: Simplify right side
   1,055.00x = 641,007.58
5. Step 5: Solve for x
   x = 641,007.58/1,055.00
6. Step 6: Final answer
   x = 607.59