Finding the Fourth Proportional to 2,186.34, 3,018.38 and 1,515.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.34 : 3,018.38 = 1,515.12 : x
2. Step 2: Convert to fraction form
   2,186.34/3,018.38 = 1,515.12/x
3. Step 3: Cross multiply
   2,186.34x = 3,018.38 × 1,515.12
4. Step 4: Simplify right side
   2,186.34x = 4,573,200.33
5. Step 5: Solve for x
   x = 4,573,200.33/2,186.34
6. Step 6: Final answer
   x = 2,091.72