Finding the Fourth Proportional to 1,500.87, 2,072.06 and 1,005.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,500.87 : 2,072.06 = 1,005.15 : x
2. Step 2: Convert to fraction form
   1,500.87/2,072.06 = 1,005.15/x
3. Step 3: Cross multiply
   1,500.87x = 2,072.06 × 1,005.15
4. Step 4: Simplify right side
   1,500.87x = 2,082,743.28
5. Step 5: Solve for x
   x = 2,082,743.28/1,500.87
6. Step 6: Final answer
   x = 1,387.69