Finding the Fourth Proportional to 1,422.37, 2,131.38 and 1,055.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.37 : 2,131.38 = 1,055.37 : x
2. Step 2: Convert to fraction form
   1,422.37/2,131.38 = 1,055.37/x
3. Step 3: Cross multiply
   1,422.37x = 2,131.38 × 1,055.37
4. Step 4: Simplify right side
   1,422.37x = 2,249,402.50
5. Step 5: Solve for x
   x = 2,249,402.50/1,422.37
6. Step 6: Final answer
   x = 1,581.45