Finding the Fourth Proportional to 1,309.31, 1,806.30 and 1,109.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.31 : 1,806.30 = 1,109.29 : x
2. Step 2: Convert to fraction form
   1,309.31/1,806.30 = 1,109.29/x
3. Step 3: Cross multiply
   1,309.31x = 1,806.30 × 1,109.29
4. Step 4: Simplify right side
   1,309.31x = 2,003,710.53
5. Step 5: Solve for x
   x = 2,003,710.53/1,309.31
6. Step 6: Final answer
   x = 1,530.36