Finding the Fourth Proportional to 10,920.72, 16,386.48 and 5,070.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.72 : 16,386.48 = 5,070.36 : x
2. Step 2: Convert to fraction form
   10,920.72/16,386.48 = 5,070.36/x
3. Step 3: Cross multiply
   10,920.72x = 16,386.48 × 5,070.36
4. Step 4: Simplify right side
   10,920.72x = 83,085,352.73
5. Step 5: Solve for x
   x = 83,085,352.73/10,920.72
6. Step 6: Final answer
   x = 7,608.05