Finding the Fourth Proportional to 1,109.16, 1,664.82 and 906.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.16 : 1,664.82 = 906.21 : x
2. Step 2: Convert to fraction form
   1,109.16/1,664.82 = 906.21/x
3. Step 3: Cross multiply
   1,109.16x = 1,664.82 × 906.21
4. Step 4: Simplify right side
   1,109.16x = 1,508,676.53
5. Step 5: Solve for x
   x = 1,508,676.53/1,109.16
6. Step 6: Final answer
   x = 1,360.20