Finding the Fourth Proportional to 11,747.72, 16,212.60 and 7,761.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,747.72 : 16,212.60 = 7,761.86 : x
2. Step 2: Convert to fraction form
   11,747.72/16,212.60 = 7,761.86/x
3. Step 3: Cross multiply
   11,747.72x = 16,212.60 × 7,761.86
4. Step 4: Simplify right side
   11,747.72x = 125,839,931.44
5. Step 5: Solve for x
   x = 125,839,931.44/11,747.72
6. Step 6: Final answer
   x = 10,711.86