Finding the Fourth Proportional to 1,334.87, 1,987.68 and 1,320.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,334.87 : 1,987.68 = 1,320.18 : x
2. Step 2: Convert to fraction form
   1,334.87/1,987.68 = 1,320.18/x
3. Step 3: Cross multiply
   1,334.87x = 1,987.68 × 1,320.18
4. Step 4: Simplify right side
   1,334.87x = 2,624,095.38
5. Step 5: Solve for x
   x = 2,624,095.38/1,334.87
6. Step 6: Final answer
   x = 1,965.81