Finding the Fourth Proportional to 13,100.61, 18,078.53 and 7,511.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,100.61 : 18,078.53 = 7,511.25 : x
2. Step 2: Convert to fraction form
   13,100.61/18,078.53 = 7,511.25/x
3. Step 3: Cross multiply
   13,100.61x = 18,078.53 × 7,511.25
4. Step 4: Simplify right side
   13,100.61x = 135,792,320.91
5. Step 5: Solve for x
   x = 135,792,320.91/13,100.61
6. Step 6: Final answer
   x = 10,365.34