Finding the Fourth Proportional to 13,320.72, 18,381.96 and 7,651.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320.72 : 18,381.96 = 7,651.56 : x
2. Step 2: Convert to fraction form
   13,320.72/18,381.96 = 7,651.56/x
3. Step 3: Cross multiply
   13,320.72x = 18,381.96 × 7,651.56
4. Step 4: Simplify right side
   13,320.72x = 140,650,669.86
5. Step 5: Solve for x
   x = 140,650,669.86/13,320.72
6. Step 6: Final answer
   x = 10,558.79