Finding the Fourth Proportional to 1,105.31, 1,525.29 and 607.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.31 : 1,525.29 = 607.90 : x
2. Step 2: Convert to fraction form
   1,105.31/1,525.29 = 607.90/x
3. Step 3: Cross multiply
   1,105.31x = 1,525.29 × 607.90
4. Step 4: Simplify right side
   1,105.31x = 927,223.79
5. Step 5: Solve for x
   x = 927,223.79/1,105.31
6. Step 6: Final answer
   x = 838.88