Finding the Fourth Proportional to 11,890.32, 16,405.80 and 7,697.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,890.32 : 16,405.80 = 7,697.76 : x
2. Step 2: Convert to fraction form
   11,890.32/16,405.80 = 7,697.76/x
3. Step 3: Cross multiply
   11,890.32x = 16,405.80 × 7,697.76
4. Step 4: Simplify right side
   11,890.32x = 126,287,911.01
5. Step 5: Solve for x
   x = 126,287,911.01/11,890.32
6. Step 6: Final answer
   x = 10,621.07