Finding the Fourth Proportional to 10,859.90, 16,298.06 and 7,945.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,859.90 : 16,298.06 = 7,945.72 : x
2. Step 2: Convert to fraction form
   10,859.90/16,298.06 = 7,945.72/x
3. Step 3: Cross multiply
   10,859.90x = 16,298.06 × 7,945.72
4. Step 4: Simplify right side
   10,859.90x = 129,499,821.30
5. Step 5: Solve for x
   x = 129,499,821.30/10,859.90
6. Step 6: Final answer
   x = 11,924.59