Finding the Fourth Proportional to 15,752.72, 21,737.94 and 8,678.98

Step by Step Solution

1. Step 1: Write the proportion equation
   15,752.72 : 21,737.94 = 8,678.98 : x
2. Step 2: Convert to fraction form
   15,752.72/21,737.94 = 8,678.98/x
3. Step 3: Cross multiply
   15,752.72x = 21,737.94 × 8,678.98
4. Step 4: Simplify right side
   15,752.72x = 188,663,146.50
5. Step 5: Solve for x
   x = 188,663,146.50/15,752.72
6. Step 6: Final answer
   x = 11,976.54