Finding the Fourth Proportional to 2,131.34, 2,938.56 and 1,431.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.34 : 2,938.56 = 1,431.50 : x
2. Step 2: Convert to fraction form
   2,131.34/2,938.56 = 1,431.50/x
3. Step 3: Cross multiply
   2,131.34x = 2,938.56 × 1,431.50
4. Step 4: Simplify right side
   2,131.34x = 4,206,548.64
5. Step 5: Solve for x
   x = 4,206,548.64/2,131.34
6. Step 6: Final answer
   x = 1,973.66