Finding the Fourth Proportional to 11,421.36, 17,120.42 and 5,185.82

Step by Step Solution

1. Step 1: Write the proportion equation
   11,421.36 : 17,120.42 = 5,185.82 : x
2. Step 2: Convert to fraction form
   11,421.36/17,120.42 = 5,185.82/x
3. Step 3: Cross multiply
   11,421.36x = 17,120.42 × 5,185.82
4. Step 4: Simplify right side
   11,421.36x = 88,783,343.81
5. Step 5: Solve for x
   x = 88,783,343.81/11,421.36
6. Step 6: Final answer
   x = 7,773.45