Finding the Fourth Proportional to 21,384.61, 29,503.53 and 13,840.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,384.61 : 29,503.53 = 13,840.48 : x
2. Step 2: Convert to fraction form
   21,384.61/29,503.53 = 13,840.48/x
3. Step 3: Cross multiply
   21,384.61x = 29,503.53 × 13,840.48
4. Step 4: Simplify right side
   21,384.61x = 408,343,016.89
5. Step 5: Solve for x
   x = 408,343,016.89/21,384.61
6. Step 6: Final answer
   x = 19,095.18