Finding the Fourth Proportional to 21,076.73, 31,605.86 and 7,919.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,076.73 : 31,605.86 = 7,919.87 : x
2. Step 2: Convert to fraction form
   21,076.73/31,605.86 = 7,919.87/x
3. Step 3: Cross multiply
   21,076.73x = 31,605.86 × 7,919.87
4. Step 4: Simplify right side
   21,076.73x = 250,314,104.81
5. Step 5: Solve for x
   x = 250,314,104.81/21,076.73
6. Step 6: Final answer
   x = 11,876.32