Finding the Fourth Proportional to 21,086.16, 31,604.88 and 7,930.14

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.16 : 31,604.88 = 7,930.14 : x
2. Step 2: Convert to fraction form
   21,086.16/31,604.88 = 7,930.14/x
3. Step 3: Cross multiply
   21,086.16x = 31,604.88 × 7,930.14
4. Step 4: Simplify right side
   21,086.16x = 250,631,123.08
5. Step 5: Solve for x
   x = 250,631,123.08/21,086.16
6. Step 6: Final answer
   x = 11,886.05