Finding the Fourth Proportional to 2,012.16, 3,015.84 and 1,038.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.16 : 3,015.84 = 1,038.72 : x
2. Step 2: Convert to fraction form
   2,012.16/3,015.84 = 1,038.72/x
3. Step 3: Cross multiply
   2,012.16x = 3,015.84 × 1,038.72
4. Step 4: Simplify right side
   2,012.16x = 3,132,613.32
5. Step 5: Solve for x
   x = 3,132,613.32/2,012.16
6. Step 6: Final answer
   x = 1,556.84