Finding the Fourth Proportional to 10,809.88, 16,209.42 and 4,961.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,809.88 : 16,209.42 = 4,961.50 : x
2. Step 2: Convert to fraction form
   10,809.88/16,209.42 = 4,961.50/x
3. Step 3: Cross multiply
   10,809.88x = 16,209.42 × 4,961.50
4. Step 4: Simplify right side
   10,809.88x = 80,423,037.33
5. Step 5: Solve for x
   x = 80,423,037.33/10,809.88
6. Step 6: Final answer
   x = 7,439.77