Finding the Fourth Proportional to 1,105.72, 1,525.90 and 608.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.72 : 1,525.90 = 608.36 : x
2. Step 2: Convert to fraction form
   1,105.72/1,525.90 = 608.36/x
3. Step 3: Cross multiply
   1,105.72x = 1,525.90 × 608.36
4. Step 4: Simplify right side
   1,105.72x = 928,296.52
5. Step 5: Solve for x
   x = 928,296.52/1,105.72
6. Step 6: Final answer
   x = 839.54