Finding the Fourth Proportional to 19,953.51, 29,940.71 and 12,931.73

Step by Step Solution

1. Step 1: Write the proportion equation
   19,953.51 : 29,940.71 = 12,931.73 : x
2. Step 2: Convert to fraction form
   19,953.51/29,940.71 = 12,931.73/x
3. Step 3: Cross multiply
   19,953.51x = 29,940.71 × 12,931.73
4. Step 4: Simplify right side
   19,953.51x = 387,185,100.55
5. Step 5: Solve for x
   x = 387,185,100.55/19,953.51
6. Step 6: Final answer
   x = 19,404.36