Finding the Fourth Proportional to 1,422.72, 2,131.11 and 1,147.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.72 : 2,131.11 = 1,147.32 : x
2. Step 2: Convert to fraction form
   1,422.72/2,131.11 = 1,147.32/x
3. Step 3: Cross multiply
   1,422.72x = 2,131.11 × 1,147.32
4. Step 4: Simplify right side
   1,422.72x = 2,445,065.13
5. Step 5: Solve for x
   x = 2,445,065.13/1,422.72
6. Step 6: Final answer
   x = 1,718.58