Finding the Fourth Proportional to 21,014.01, 31,499.73 and 13,623.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,014.01 : 31,499.73 = 13,623.15 : x
2. Step 2: Convert to fraction form
   21,014.01/31,499.73 = 13,623.15/x
3. Step 3: Cross multiply
   21,014.01x = 31,499.73 × 13,623.15
4. Step 4: Simplify right side
   21,014.01x = 429,125,546.75
5. Step 5: Solve for x
   x = 429,125,546.75/21,014.01
6. Step 6: Final answer
   x = 20,420.93