Finding the Fourth Proportional to 10,805.86, 16,200.91 and 7,287.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,805.86 : 16,200.91 = 7,287.12 : x
2. Step 2: Convert to fraction form
   10,805.86/16,200.91 = 7,287.12/x
3. Step 3: Cross multiply
   10,805.86x = 16,200.91 × 7,287.12
4. Step 4: Simplify right side
   10,805.86x = 118,057,963.89
5. Step 5: Solve for x
   x = 118,057,963.89/10,805.86
6. Step 6: Final answer
   x = 10,925.37