Finding the Fourth Proportional to 1,105.20, 1,525.12 and 607.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.20 : 1,525.12 = 607.86 : x
2. Step 2: Convert to fraction form
   1,105.20/1,525.12 = 607.86/x
3. Step 3: Cross multiply
   1,105.20x = 1,525.12 × 607.86
4. Step 4: Simplify right side
   1,105.20x = 927,057.92
5. Step 5: Solve for x
   x = 927,057.92/1,105.20
6. Step 6: Final answer
   x = 838.81