Finding the Fourth Proportional to 13,695.36, 18,899.54 and 7,407.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,695.36 : 18,899.54 = 7,407.72 : x
2. Step 2: Convert to fraction form
   13,695.36/18,899.54 = 7,407.72/x
3. Step 3: Cross multiply
   13,695.36x = 18,899.54 × 7,407.72
4. Step 4: Simplify right side
   13,695.36x = 140,002,500.45
5. Step 5: Solve for x
   x = 140,002,500.45/13,695.36
6. Step 6: Final answer
   x = 10,222.62