Finding the Fourth Proportional to 21,672.67, 32,518.39 and 7,642.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,672.67 : 32,518.39 = 7,642.72 : x
2. Step 2: Convert to fraction form
   21,672.67/32,518.39 = 7,642.72/x
3. Step 3: Cross multiply
   21,672.67x = 32,518.39 × 7,642.72
4. Step 4: Simplify right side
   21,672.67x = 248,528,748.82
5. Step 5: Solve for x
   x = 248,528,748.82/21,672.67
6. Step 6: Final answer
   x = 11,467.38