Finding the Fourth Proportional to 1,105.51, 1,662.21 and 1,019.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.51 : 1,662.21 = 1,019.90 : x
2. Step 2: Convert to fraction form
   1,105.51/1,662.21 = 1,019.90/x
3. Step 3: Cross multiply
   1,105.51x = 1,662.21 × 1,019.90
4. Step 4: Simplify right side
   1,105.51x = 1,695,287.98
5. Step 5: Solve for x
   x = 1,695,287.98/1,105.51
6. Step 6: Final answer
   x = 1,533.49