Finding the Fourth Proportional to 1,109.53, 1,662.87 and 938.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.53 : 1,662.87 = 938.22 : x
2. Step 2: Convert to fraction form
   1,109.53/1,662.87 = 938.22/x
3. Step 3: Cross multiply
   1,109.53x = 1,662.87 × 938.22
4. Step 4: Simplify right side
   1,109.53x = 1,560,137.89
5. Step 5: Solve for x
   x = 1,560,137.89/1,109.53
6. Step 6: Final answer
   x = 1,406.13