Finding the Fourth Proportional to 16,776.72, 25,142.40 and 7,415.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,776.72 : 25,142.40 = 7,415.15 : x
2. Step 2: Convert to fraction form
   16,776.72/25,142.40 = 7,415.15/x
3. Step 3: Cross multiply
   16,776.72x = 25,142.40 × 7,415.15
4. Step 4: Simplify right side
   16,776.72x = 186,434,541.65
5. Step 5: Solve for x
   x = 186,434,541.65/16,776.72
6. Step 6: Final answer
   x = 11,112.69