Finding the Fourth Proportional to 2,126.98, 2,935.43 and 1,287.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,126.98 : 2,935.43 = 1,287.89 : x
2. Step 2: Convert to fraction form
   2,126.98/2,935.43 = 1,287.89/x
3. Step 3: Cross multiply
   2,126.98x = 2,935.43 × 1,287.89
4. Step 4: Simplify right side
   2,126.98x = 3,780,489.83
5. Step 5: Solve for x
   x = 3,780,489.83/2,126.98
6. Step 6: Final answer
   x = 1,777.40