Finding the Fourth Proportional to 21,940.39, 32,913.99 and 7,145.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,940.39 : 32,913.99 = 7,145.86 : x
2. Step 2: Convert to fraction form
   21,940.39/32,913.99 = 7,145.86/x
3. Step 3: Cross multiply
   21,940.39x = 32,913.99 × 7,145.86
4. Step 4: Simplify right side
   21,940.39x = 235,198,832.52
5. Step 5: Solve for x
   x = 235,198,832.52/21,940.39
6. Step 6: Final answer
   x = 10,719.90