Finding the Fourth Proportional to 21,424.16, 29,561.83 and 13,460.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,424.16 : 29,561.83 = 13,460.75 : x
2. Step 2: Convert to fraction form
   21,424.16/29,561.83 = 13,460.75/x
3. Step 3: Cross multiply
   21,424.16x = 29,561.83 × 13,460.75
4. Step 4: Simplify right side
   21,424.16x = 397,924,403.17
5. Step 5: Solve for x
   x = 397,924,403.17/21,424.16
6. Step 6: Final answer
   x = 18,573.63