Finding the Fourth Proportional to 1,535.30, 2,119.59 and 1,012.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.30 : 2,119.59 = 1,012.24 : x
2. Step 2: Convert to fraction form
   1,535.30/2,119.59 = 1,012.24/x
3. Step 3: Cross multiply
   1,535.30x = 2,119.59 × 1,012.24
4. Step 4: Simplify right side
   1,535.30x = 2,145,536.43
5. Step 5: Solve for x
   x = 2,145,536.43/1,535.30
6. Step 6: Final answer
   x = 1,397.47