Finding the Fourth Proportional to 10,610.42, 15,900.56 and 7,815.16

Step by Step Solution

1. Step 1: Write the proportion equation
   10,610.42 : 15,900.56 = 7,815.16 : x
2. Step 2: Convert to fraction form
   10,610.42/15,900.56 = 7,815.16/x
3. Step 3: Cross multiply
   10,610.42x = 15,900.56 × 7,815.16
4. Step 4: Simplify right side
   10,610.42x = 124,265,420.49
5. Step 5: Solve for x
   x = 124,265,420.49/10,610.42
6. Step 6: Final answer
   x = 11,711.64