Finding the Fourth Proportional to 1,105.22, 1,525.20 and 607.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.22 : 1,525.20 = 607.91 : x
2. Step 2: Convert to fraction form
   1,105.22/1,525.20 = 607.91/x
3. Step 3: Cross multiply
   1,105.22x = 1,525.20 × 607.91
4. Step 4: Simplify right side
   1,105.22x = 927,176.71
5. Step 5: Solve for x
   x = 927,176.71/1,105.22
6. Step 6: Final answer
   x = 838.91