Finding the Fourth Proportional to 21,427.72, 32,146.71 and 8,940.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,427.72 : 32,146.71 = 8,940.81 : x
2. Step 2: Convert to fraction form
   21,427.72/32,146.71 = 8,940.81/x
3. Step 3: Cross multiply
   21,427.72x = 32,146.71 × 8,940.81
4. Step 4: Simplify right side
   21,427.72x = 287,417,713.26
5. Step 5: Solve for x
   x = 287,417,713.26/21,427.72
6. Step 6: Final answer
   x = 13,413.36