Finding the Fourth Proportional to 2,316.60, 3,196.89 and 1,321.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,316.60 : 3,196.89 = 1,321.91 : x
2. Step 2: Convert to fraction form
   2,316.60/3,196.89 = 1,321.91/x
3. Step 3: Cross multiply
   2,316.60x = 3,196.89 × 1,321.91
4. Step 4: Simplify right side
   2,316.60x = 4,225,984.88
5. Step 5: Solve for x
   x = 4,225,984.88/2,316.60
6. Step 6: Final answer
   x = 1,824.22