Finding the Fourth Proportional to 1,511.37, 2,085.72 and 987.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.37 : 2,085.72 = 987.09 : x
2. Step 2: Convert to fraction form
   1,511.37/2,085.72 = 987.09/x
3. Step 3: Cross multiply
   1,511.37x = 2,085.72 × 987.09
4. Step 4: Simplify right side
   1,511.37x = 2,058,793.35
5. Step 5: Solve for x
   x = 2,058,793.35/1,511.37
6. Step 6: Final answer
   x = 1,362.20