Finding the Fourth Proportional to 10,644.86, 14,665.43 and 8,405.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,644.86 : 14,665.43 = 8,405.91 : x
2. Step 2: Convert to fraction form
   10,644.86/14,665.43 = 8,405.91/x
3. Step 3: Cross multiply
   10,644.86x = 14,665.43 × 8,405.91
4. Step 4: Simplify right side
   10,644.86x = 123,276,242.66
5. Step 5: Solve for x
   x = 123,276,242.66/10,644.86
6. Step 6: Final answer
   x = 11,580.83