Finding the Fourth Proportional to 21,085.21, 31,642.59 and 15,552.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,085.21 : 31,642.59 = 15,552.91 : x
2. Step 2: Convert to fraction form
   21,085.21/31,642.59 = 15,552.91/x
3. Step 3: Cross multiply
   21,085.21x = 31,642.59 × 15,552.91
4. Step 4: Simplify right side
   21,085.21x = 492,134,196.22
5. Step 5: Solve for x
   x = 492,134,196.22/21,085.21
6. Step 6: Final answer
   x = 23,340.26