Finding the Fourth Proportional to 7,691.31, 10,632.86 and 7,621.11

Step by Step Solution

1. Step 1: Write the proportion equation
   7,691.31 : 10,632.86 = 7,621.11 : x
2. Step 2: Convert to fraction form
   7,691.31/10,632.86 = 7,621.11/x
3. Step 3: Cross multiply
   7,691.31x = 10,632.86 × 7,621.11
4. Step 4: Simplify right side
   7,691.31x = 81,034,157.57
5. Step 5: Solve for x
   x = 81,034,157.57/7,691.31
6. Step 6: Final answer
   x = 10,535.81