Finding the Fourth Proportional to 13,487.86, 18,613.20 and 7,519.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,487.86 : 18,613.20 = 7,519.60 : x
2. Step 2: Convert to fraction form
   13,487.86/18,613.20 = 7,519.60/x
3. Step 3: Cross multiply
   13,487.86x = 18,613.20 × 7,519.60
4. Step 4: Simplify right side
   13,487.86x = 139,963,818.72
5. Step 5: Solve for x
   x = 139,963,818.72/13,487.86
6. Step 6: Final answer
   x = 10,377.02