Finding the Fourth Proportional to 22,546.80, 31,116.72 and 12,987.08

Step by Step Solution

1. Step 1: Write the proportion equation
   22,546.80 : 31,116.72 = 12,987.08 : x
2. Step 2: Convert to fraction form
   22,546.80/31,116.72 = 12,987.08/x
3. Step 3: Cross multiply
   22,546.80x = 31,116.72 × 12,987.08
4. Step 4: Simplify right side
   22,546.80x = 404,115,331.98
5. Step 5: Solve for x
   x = 404,115,331.98/22,546.80
6. Step 6: Final answer
   x = 17,923.40