Finding the Fourth Proportional to 1,984.60, 2,735.31 and 1,320.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,984.60 : 2,735.31 = 1,320.31 : x
2. Step 2: Convert to fraction form
   1,984.60/2,735.31 = 1,320.31/x
3. Step 3: Cross multiply
   1,984.60x = 2,735.31 × 1,320.31
4. Step 4: Simplify right side
   1,984.60x = 3,611,457.15
5. Step 5: Solve for x
   x = 3,611,457.15/1,984.60
6. Step 6: Final answer
   x = 1,819.74