Finding the Fourth Proportional to 11,419.15, 17,128.48 and 5,263.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,419.15 : 17,128.48 = 5,263.15 : x
2. Step 2: Convert to fraction form
   11,419.15/17,128.48 = 5,263.15/x
3. Step 3: Cross multiply
   11,419.15x = 17,128.48 × 5,263.15
4. Step 4: Simplify right side
   11,419.15x = 90,149,759.51
5. Step 5: Solve for x
   x = 90,149,759.51/11,419.15
6. Step 6: Final answer
   x = 7,894.61