Finding the Fourth Proportional to 11,642.43, 16,085.37 and 8,121.36

Step by Step Solution

1. Step 1: Write the proportion equation
   11,642.43 : 16,085.37 = 8,121.36 : x
2. Step 2: Convert to fraction form
   11,642.43/16,085.37 = 8,121.36/x
3. Step 3: Cross multiply
   11,642.43x = 16,085.37 × 8,121.36
4. Step 4: Simplify right side
   11,642.43x = 130,635,080.50
5. Step 5: Solve for x
   x = 130,635,080.50/11,642.43
6. Step 6: Final answer
   x = 11,220.60