Finding the Fourth Proportional to 1,105.09, 1,525.03 and 607.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.09 : 1,525.03 = 607.78 : x
2. Step 2: Convert to fraction form
   1,105.09/1,525.03 = 607.78/x
3. Step 3: Cross multiply
   1,105.09x = 1,525.03 × 607.78
4. Step 4: Simplify right side
   1,105.09x = 926,882.73
5. Step 5: Solve for x
   x = 926,882.73/1,105.09
6. Step 6: Final answer
   x = 838.74