Finding the Fourth Proportional to 12,721.32, 17,555.40 and 7,415.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.32 : 17,555.40 = 7,415.10 : x
2. Step 2: Convert to fraction form
   12,721.32/17,555.40 = 7,415.10/x
3. Step 3: Cross multiply
   12,721.32x = 17,555.40 × 7,415.10
4. Step 4: Simplify right side
   12,721.32x = 130,175,046.54
5. Step 5: Solve for x
   x = 130,175,046.54/12,721.32
6. Step 6: Final answer
   x = 10,232.83