Finding the Fourth Proportional to 19,680.86, 27,159.59 and 10,728.39

Step by Step Solution

1. Step 1: Write the proportion equation
   19,680.86 : 27,159.59 = 10,728.39 : x
2. Step 2: Convert to fraction form
   19,680.86/27,159.59 = 10,728.39/x
3. Step 3: Cross multiply
   19,680.86x = 27,159.59 × 10,728.39
4. Step 4: Simplify right side
   19,680.86x = 291,378,656.32
5. Step 5: Solve for x
   x = 291,378,656.32/19,680.86
6. Step 6: Final answer
   x = 14,805.18