Finding the Fourth Proportional to 10,077.84, 13,920.72 and 8,404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,077.84 : 13,920.72 = 8,404.72 : x
2. Step 2: Convert to fraction form
   10,077.84/13,920.72 = 8,404.72/x
3. Step 3: Cross multiply
   10,077.84x = 13,920.72 × 8,404.72
4. Step 4: Simplify right side
   10,077.84x = 116,999,753.80
5. Step 5: Solve for x
   x = 116,999,753.80/10,077.84
6. Step 6: Final answer
   x = 11,609.61