Finding the Fourth Proportional to 21,168.54, 31,618.72 and 19,953.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168.54 : 31,618.72 = 19,953.98 : x
2. Step 2: Convert to fraction form
   21,168.54/31,618.72 = 19,953.98/x
3. Step 3: Cross multiply
   21,168.54x = 31,618.72 × 19,953.98
4. Step 4: Simplify right side
   21,168.54x = 630,919,291.92
5. Step 5: Solve for x
   x = 630,919,291.92/21,168.54
6. Step 6: Final answer
   x = 29,804.57