Finding the Fourth Proportional to 2,316.36, 3,196.61 and 1,321.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,316.36 : 3,196.61 = 1,321.70 : x
2. Step 2: Convert to fraction form
   2,316.36/3,196.61 = 1,321.70/x
3. Step 3: Cross multiply
   2,316.36x = 3,196.61 × 1,321.70
4. Step 4: Simplify right side
   2,316.36x = 4,224,936.85
5. Step 5: Solve for x
   x = 4,224,936.85/2,316.36
6. Step 6: Final answer
   x = 1,823.96