Finding the Fourth Proportional to 11,905.32, 16,391.88 and 10,109.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,905.32 : 16,391.88 = 10,109.25 : x
2. Step 2: Convert to fraction form
   11,905.32/16,391.88 = 10,109.25/x
3. Step 3: Cross multiply
   11,905.32x = 16,391.88 × 10,109.25
4. Step 4: Simplify right side
   11,905.32x = 165,709,612.89
5. Step 5: Solve for x
   x = 165,709,612.89/11,905.32
6. Step 6: Final answer
   x = 13,918.95