Finding the Fourth Proportional to 10,929.72, 16,402.55 and 4,357.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,929.72 : 16,402.55 = 4,357.78 : x
2. Step 2: Convert to fraction form
   10,929.72/16,402.55 = 4,357.78/x
3. Step 3: Cross multiply
   10,929.72x = 16,402.55 × 4,357.78
4. Step 4: Simplify right side
   10,929.72x = 71,478,758.32
5. Step 5: Solve for x
   x = 71,478,758.32/10,929.72
6. Step 6: Final answer
   x = 6,539.85