Finding the Fourth Proportional to 11,009.81, 16,517.42 and 5,159.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,009.81 : 16,517.42 = 5,159.60 : x
2. Step 2: Convert to fraction form
   11,009.81/16,517.42 = 5,159.60/x
3. Step 3: Cross multiply
   11,009.81x = 16,517.42 × 5,159.60
4. Step 4: Simplify right side
   11,009.81x = 85,223,254.43
5. Step 5: Solve for x
   x = 85,223,254.43/11,009.81
6. Step 6: Final answer
   x = 7,740.67