Finding the Fourth Proportional to 1,422.83, 1,961.73 and 1,187.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.83 : 1,961.73 = 1,187.12 : x
2. Step 2: Convert to fraction form
   1,422.83/1,961.73 = 1,187.12/x
3. Step 3: Cross multiply
   1,422.83x = 1,961.73 × 1,187.12
4. Step 4: Simplify right side
   1,422.83x = 2,328,808.92
5. Step 5: Solve for x
   x = 2,328,808.92/1,422.83
6. Step 6: Final answer
   x = 1,636.74