Finding the Fourth Proportional to 12,661.16, 17,465.10 and 7,621.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.16 : 17,465.10 = 7,621.88 : x
2. Step 2: Convert to fraction form
   12,661.16/17,465.10 = 7,621.88/x
3. Step 3: Cross multiply
   12,661.16x = 17,465.10 × 7,621.88
4. Step 4: Simplify right side
   12,661.16x = 133,116,896.39
5. Step 5: Solve for x
   x = 133,116,896.39/12,661.16
6. Step 6: Final answer
   x = 10,513.80