Finding the Fourth Proportional to 21,665.86, 32,507.43 and 7,815.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.86 : 32,507.43 = 7,815.94 : x
2. Step 2: Convert to fraction form
   21,665.86/32,507.43 = 7,815.94/x
3. Step 3: Cross multiply
   21,665.86x = 32,507.43 × 7,815.94
4. Step 4: Simplify right side
   21,665.86x = 254,076,122.43
5. Step 5: Solve for x
   x = 254,076,122.43/21,665.86
6. Step 6: Final answer
   x = 11,727.03