Finding the Fourth Proportional to 10,886.56, 16,310.70 and 7,761.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,886.56 : 16,310.70 = 7,761.89 : x
2. Step 2: Convert to fraction form
   10,886.56/16,310.70 = 7,761.89/x
3. Step 3: Cross multiply
   10,886.56x = 16,310.70 × 7,761.89
4. Step 4: Simplify right side
   10,886.56x = 126,601,900.00
5. Step 5: Solve for x
   x = 126,601,900.00/10,886.56
6. Step 6: Final answer
   x = 11,629.19