Finding the Fourth Proportional to 8,005.79, 12,002.16 and 4,921.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,005.79 : 12,002.16 = 4,921.31 : x
2. Step 2: Convert to fraction form
   8,005.79/12,002.16 = 4,921.31/x
3. Step 3: Cross multiply
   8,005.79x = 12,002.16 × 4,921.31
4. Step 4: Simplify right side
   8,005.79x = 59,066,350.03
5. Step 5: Solve for x
   x = 59,066,350.03/8,005.79
6. Step 6: Final answer
   x = 7,377.95