Finding the Fourth Proportional to 10,932.48, 16,390.08 and 7,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,932.48 : 16,390.08 = 7,812.72 : x
2. Step 2: Convert to fraction form
   10,932.48/16,390.08 = 7,812.72/x
3. Step 3: Cross multiply
   10,932.48x = 16,390.08 × 7,812.72
4. Step 4: Simplify right side
   10,932.48x = 128,051,105.82
5. Step 5: Solve for x
   x = 128,051,105.82/10,932.48
6. Step 6: Final answer
   x = 11,712.91