Finding the Fourth Proportional to 2,175.78, 3,003.86 and 1,431.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,175.78 : 3,003.86 = 1,431.04 : x
2. Step 2: Convert to fraction form
   2,175.78/3,003.86 = 1,431.04/x
3. Step 3: Cross multiply
   2,175.78x = 3,003.86 × 1,431.04
4. Step 4: Simplify right side
   2,175.78x = 4,298,643.81
5. Step 5: Solve for x
   x = 4,298,643.81/2,175.78
6. Step 6: Final answer
   x = 1,975.68