Finding the Fourth Proportional to 2,389.88, 3,584.70 and 1,422.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.88 : 3,584.70 = 1,422.12 : x
2. Step 2: Convert to fraction form
   2,389.88/3,584.70 = 1,422.12/x
3. Step 3: Cross multiply
   2,389.88x = 3,584.70 × 1,422.12
4. Step 4: Simplify right side
   2,389.88x = 5,097,873.56
5. Step 5: Solve for x
   x = 5,097,873.56/2,389.88
6. Step 6: Final answer
   x = 2,133.11