Finding the Fourth Proportional to 20,940.53, 31,421.42 and 13,925.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,940.53 : 31,421.42 = 13,925.42 : x
2. Step 2: Convert to fraction form
   20,940.53/31,421.42 = 13,925.42/x
3. Step 3: Cross multiply
   20,940.53x = 31,421.42 × 13,925.42
4. Step 4: Simplify right side
   20,940.53x = 437,556,413.81
5. Step 5: Solve for x
   x = 437,556,413.81/20,940.53
6. Step 6: Final answer
   x = 20,895.20