Finding the Fourth Proportional to 1,499.78, 2,066.42 and 1,120.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.78 : 2,066.42 = 1,120.09 : x
2. Step 2: Convert to fraction form
   1,499.78/2,066.42 = 1,120.09/x
3. Step 3: Cross multiply
   1,499.78x = 2,066.42 × 1,120.09
4. Step 4: Simplify right side
   1,499.78x = 2,314,576.38
5. Step 5: Solve for x
   x = 2,314,576.38/1,499.78
6. Step 6: Final answer
   x = 1,543.28