Finding the Fourth Proportional to 11,781.86, 17,663.52 and 8,072.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,781.86 : 17,663.52 = 8,072.78 : x
2. Step 2: Convert to fraction form
   11,781.86/17,663.52 = 8,072.78/x
3. Step 3: Cross multiply
   11,781.86x = 17,663.52 × 8,072.78
4. Step 4: Simplify right side
   11,781.86x = 142,593,710.99
5. Step 5: Solve for x
   x = 142,593,710.99/11,781.86
6. Step 6: Final answer
   x = 12,102.82