Finding the Fourth Proportional to 2,164.73, 2,987.28 and 1,220.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.73 : 2,987.28 = 1,220.50 : x
2. Step 2: Convert to fraction form
   2,164.73/2,987.28 = 1,220.50/x
3. Step 3: Cross multiply
   2,164.73x = 2,987.28 × 1,220.50
4. Step 4: Simplify right side
   2,164.73x = 3,645,978.97
5. Step 5: Solve for x
   x = 3,645,978.97/2,164.73
6. Step 6: Final answer
   x = 1,684.27