Finding the Fourth Proportional to 10,920.42, 16,353.90 and 5,078.70

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.42 : 16,353.90 = 5,078.70 : x
2. Step 2: Convert to fraction form
   10,920.42/16,353.90 = 5,078.70/x
3. Step 3: Cross multiply
   10,920.42x = 16,353.90 × 5,078.70
4. Step 4: Simplify right side
   10,920.42x = 83,056,551.93
5. Step 5: Solve for x
   x = 83,056,551.93/10,920.42
6. Step 6: Final answer
   x = 7,605.62