Finding the Fourth Proportional to 15,498.07, 21,383.79 and 8,782.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,498.07 : 21,383.79 = 8,782.15 : x
2. Step 2: Convert to fraction form
   15,498.07/21,383.79 = 8,782.15/x
3. Step 3: Cross multiply
   15,498.07x = 21,383.79 × 8,782.15
4. Step 4: Simplify right side
   15,498.07x = 187,795,651.35
5. Step 5: Solve for x
   x = 187,795,651.35/15,498.07
6. Step 6: Final answer
   x = 12,117.36