Finding the Fourth Proportional to 13,571.61, 18,728.59 and 7,603.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,571.61 : 18,728.59 = 7,603.35 : x
2. Step 2: Convert to fraction form
   13,571.61/18,728.59 = 7,603.35/x
3. Step 3: Cross multiply
   13,571.61x = 18,728.59 × 7,603.35
4. Step 4: Simplify right side
   13,571.61x = 142,400,024.78
5. Step 5: Solve for x
   x = 142,400,024.78/13,571.61
6. Step 6: Final answer
   x = 10,492.49