Finding the Fourth Proportional to 22,216.06, 30,661.50 and 12,782.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,216.06 : 30,661.50 = 12,782.80 : x
2. Step 2: Convert to fraction form
   22,216.06/30,661.50 = 12,782.80/x
3. Step 3: Cross multiply
   22,216.06x = 30,661.50 × 12,782.80
4. Step 4: Simplify right side
   22,216.06x = 391,939,822.20
5. Step 5: Solve for x
   x = 391,939,822.20/22,216.06
6. Step 6: Final answer
   x = 17,642.18