Finding the Fourth Proportional to 19,160.72, 28,740.28 and 5,309.36

Step by Step Solution

1. Step 1: Write the proportion equation
   19,160.72 : 28,740.28 = 5,309.36 : x
2. Step 2: Convert to fraction form
   19,160.72/28,740.28 = 5,309.36/x
3. Step 3: Cross multiply
   19,160.72x = 28,740.28 × 5,309.36
4. Step 4: Simplify right side
   19,160.72x = 152,592,493.02
5. Step 5: Solve for x
   x = 152,592,493.02/19,160.72
6. Step 6: Final answer
   x = 7,963.82