Finding the Fourth Proportional to 21,078.90, 31,594.01 and 7,922.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,078.90 : 31,594.01 = 7,922.88 : x
2. Step 2: Convert to fraction form
   21,078.90/31,594.01 = 7,922.88/x
3. Step 3: Cross multiply
   21,078.90x = 31,594.01 × 7,922.88
4. Step 4: Simplify right side
   21,078.90x = 250,315,510.33
5. Step 5: Solve for x
   x = 250,315,510.33/21,078.90
6. Step 6: Final answer
   x = 11,875.17