Finding the Fourth Proportional to 21,580.32, 29,773.71 and 12,621.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,580.32 : 29,773.71 = 12,621.48 : x
2. Step 2: Convert to fraction form
   21,580.32/29,773.71 = 12,621.48/x
3. Step 3: Cross multiply
   21,580.32x = 29,773.71 × 12,621.48
4. Step 4: Simplify right side
   21,580.32x = 375,788,285.29
5. Step 5: Solve for x
   x = 375,788,285.29/21,580.32
6. Step 6: Final answer
   x = 17,413.47