Finding the Fourth Proportional to 10,645.30, 15,948.49 and 7,716.34

Step by Step Solution

1. Step 1: Write the proportion equation
   10,645.30 : 15,948.49 = 7,716.34 : x
2. Step 2: Convert to fraction form
   10,645.30/15,948.49 = 7,716.34/x
3. Step 3: Cross multiply
   10,645.30x = 15,948.49 × 7,716.34
4. Step 4: Simplify right side
   10,645.30x = 123,063,971.33
5. Step 5: Solve for x
   x = 123,063,971.33/10,645.30
6. Step 6: Final answer
   x = 11,560.40