Finding the Fourth Proportional to 11,388.51, 17,113.91 and 10,641.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,388.51 : 17,113.91 = 10,641.15 : x
2. Step 2: Convert to fraction form
   11,388.51/17,113.91 = 10,641.15/x
3. Step 3: Cross multiply
   11,388.51x = 17,113.91 × 10,641.15
4. Step 4: Simplify right side
   11,388.51x = 182,111,630.19
5. Step 5: Solve for x
   x = 182,111,630.19/11,388.51
6. Step 6: Final answer
   x = 15,990.82