Finding the Fourth Proportional to 2,091.60, 3,136.80 and 995.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.60 : 3,136.80 = 995.64 : x
2. Step 2: Convert to fraction form
   2,091.60/3,136.80 = 995.64/x
3. Step 3: Cross multiply
   2,091.60x = 3,136.80 × 995.64
4. Step 4: Simplify right side
   2,091.60x = 3,123,123.55
5. Step 5: Solve for x
   x = 3,123,123.55/2,091.60
6. Step 6: Final answer
   x = 1,493.17