Finding the Fourth Proportional to 12,932.28, 19,380.20 and 7,389.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,932.28 : 19,380.20 = 7,389.45 : x
2. Step 2: Convert to fraction form
   12,932.28/19,380.20 = 7,389.45/x
3. Step 3: Cross multiply
   12,932.28x = 19,380.20 × 7,389.45
4. Step 4: Simplify right side
   12,932.28x = 143,208,981.94
5. Step 5: Solve for x
   x = 143,208,981.94/12,932.28
6. Step 6: Final answer
   x = 11,073.76