Finding the Fourth Proportional to 3,987.47, 5,981.42 and 1,214.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.47 : 5,981.42 = 1,214.23 : x
2. Step 2: Convert to fraction form
   3,987.47/5,981.42 = 1,214.23/x
3. Step 3: Cross multiply
   3,987.47x = 5,981.42 × 1,214.23
4. Step 4: Simplify right side
   3,987.47x = 7,262,819.61
5. Step 5: Solve for x
   x = 7,262,819.61/3,987.47
6. Step 6: Final answer
   x = 1,821.41