Finding the Fourth Proportional to 2,316.42, 3,196.48 and 1,431.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,316.42 : 3,196.48 = 1,431.90 : x
2. Step 2: Convert to fraction form
   2,316.42/3,196.48 = 1,431.90/x
3. Step 3: Cross multiply
   2,316.42x = 3,196.48 × 1,431.90
4. Step 4: Simplify right side
   2,316.42x = 4,577,039.71
5. Step 5: Solve for x
   x = 4,577,039.71/2,316.42
6. Step 6: Final answer
   x = 1,975.91