Finding the Fourth Proportional to 1,105.18, 1,525.15 and 607.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.18 : 1,525.15 = 607.81 : x
2. Step 2: Convert to fraction form
   1,105.18/1,525.15 = 607.81/x
3. Step 3: Cross multiply
   1,105.18x = 1,525.15 × 607.81
4. Step 4: Simplify right side
   1,105.18x = 927,001.42
5. Step 5: Solve for x
   x = 927,001.42/1,105.18
6. Step 6: Final answer
   x = 838.78