Finding the Fourth Proportional to 2,187.10, 3,017.72 and 1,431.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.10 : 3,017.72 = 1,431.98 : x
2. Step 2: Convert to fraction form
   2,187.10/3,017.72 = 1,431.98/x
3. Step 3: Cross multiply
   2,187.10x = 3,017.72 × 1,431.98
4. Step 4: Simplify right side
   2,187.10x = 4,321,314.49
5. Step 5: Solve for x
   x = 4,321,314.49/2,187.10
6. Step 6: Final answer
   x = 1,975.82