Finding the Fourth Proportional to 8,920.79, 13,381.82 and 3,077.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.79 : 13,381.82 = 3,077.31 : x
2. Step 2: Convert to fraction form
   8,920.79/13,381.82 = 3,077.31/x
3. Step 3: Cross multiply
   8,920.79x = 13,381.82 × 3,077.31
4. Step 4: Simplify right side
   8,920.79x = 41,180,008.50
5. Step 5: Solve for x
   x = 41,180,008.50/8,920.79
6. Step 6: Final answer
   x = 4,616.18