Finding the Fourth Proportional to 1,421.18, 1,959.50 and 1,185.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.18 : 1,959.50 = 1,185.47 : x
2. Step 2: Convert to fraction form
   1,421.18/1,959.50 = 1,185.47/x
3. Step 3: Cross multiply
   1,421.18x = 1,959.50 × 1,185.47
4. Step 4: Simplify right side
   1,421.18x = 2,322,918.67
5. Step 5: Solve for x
   x = 2,322,918.67/1,421.18
6. Step 6: Final answer
   x = 1,634.51