Finding the Fourth Proportional to 8,897.72, 12,279.20 and 5,908.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,897.72 : 12,279.20 = 5,908.40 : x
2. Step 2: Convert to fraction form
   8,897.72/12,279.20 = 5,908.40/x
3. Step 3: Cross multiply
   8,897.72x = 12,279.20 × 5,908.40
4. Step 4: Simplify right side
   8,897.72x = 72,550,425.28
5. Step 5: Solve for x
   x = 72,550,425.28/8,897.72
6. Step 6: Final answer
   x = 8,153.82