Finding the Fourth Proportional to 1,136.30, 1,704.78 and 405.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,136.30 : 1,704.78 = 405.93 : x
2. Step 2: Convert to fraction form
   1,136.30/1,704.78 = 405.93/x
3. Step 3: Cross multiply
   1,136.30x = 1,704.78 × 405.93
4. Step 4: Simplify right side
   1,136.30x = 692,019.32
5. Step 5: Solve for x
   x = 692,019.32/1,136.30
6. Step 6: Final answer
   x = 609.01