Finding the Fourth Proportional to 2,140.50, 3,209.31 and 985.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.50 : 3,209.31 = 985.62 : x
2. Step 2: Convert to fraction form
   2,140.50/3,209.31 = 985.62/x
3. Step 3: Cross multiply
   2,140.50x = 3,209.31 × 985.62
4. Step 4: Simplify right side
   2,140.50x = 3,163,160.12
5. Step 5: Solve for x
   x = 3,163,160.12/2,140.50
6. Step 6: Final answer
   x = 1,477.77