Finding the Fourth Proportional to 2,018.80, 2,786.17 and 1,122.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.80 : 2,786.17 = 1,122.63 : x
2. Step 2: Convert to fraction form
   2,018.80/2,786.17 = 1,122.63/x
3. Step 3: Cross multiply
   2,018.80x = 2,786.17 × 1,122.63
4. Step 4: Simplify right side
   2,018.80x = 3,127,837.10
5. Step 5: Solve for x
   x = 3,127,837.10/2,018.80
6. Step 6: Final answer
   x = 1,549.36