Finding the Fourth Proportional to 10,748.67, 16,128.57 and 7,811.34

Step by Step Solution

1. Step 1: Write the proportion equation
   10,748.67 : 16,128.57 = 7,811.34 : x
2. Step 2: Convert to fraction form
   10,748.67/16,128.57 = 7,811.34/x
3. Step 3: Cross multiply
   10,748.67x = 16,128.57 × 7,811.34
4. Step 4: Simplify right side
   10,748.67x = 125,985,743.98
5. Step 5: Solve for x
   x = 125,985,743.98/10,748.67
6. Step 6: Final answer
   x = 11,721.05