Finding the Fourth Proportional to 13,328.13, 18,393.90 and 7,664.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,328.13 : 18,393.90 = 7,664.72 : x
2. Step 2: Convert to fraction form
   13,328.13/18,393.90 = 7,664.72/x
3. Step 3: Cross multiply
   13,328.13x = 18,393.90 × 7,664.72
4. Step 4: Simplify right side
   13,328.13x = 140,983,972.50
5. Step 5: Solve for x
   x = 140,983,972.50/13,328.13
6. Step 6: Final answer
   x = 10,577.92