Finding the Fourth Proportional to 1,536.17, 2,120.78 and 1,013.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,536.17 : 2,120.78 = 1,013.72 : x
2. Step 2: Convert to fraction form
   1,536.17/2,120.78 = 1,013.72/x
3. Step 3: Cross multiply
   1,536.17x = 2,120.78 × 1,013.72
4. Step 4: Simplify right side
   1,536.17x = 2,149,869.03
5. Step 5: Solve for x
   x = 2,149,869.03/1,536.17
6. Step 6: Final answer
   x = 1,399.50