Finding the Fourth Proportional to 12,642.49, 17,445.81 and 7,605.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.49 : 17,445.81 = 7,605.78 : x
2. Step 2: Convert to fraction form
   12,642.49/17,445.81 = 7,605.78/x
3. Step 3: Cross multiply
   12,642.49x = 17,445.81 × 7,605.78
4. Step 4: Simplify right side
   12,642.49x = 132,688,992.78
5. Step 5: Solve for x
   x = 132,688,992.78/12,642.49
6. Step 6: Final answer
   x = 10,495.48