Finding the Fourth Proportional to 8,156.86, 12,245.28 and 5,385.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,156.86 : 12,245.28 = 5,385.88 : x
2. Step 2: Convert to fraction form
   8,156.86/12,245.28 = 5,385.88/x
3. Step 3: Cross multiply
   8,156.86x = 12,245.28 × 5,385.88
4. Step 4: Simplify right side
   8,156.86x = 65,951,608.65
5. Step 5: Solve for x
   x = 65,951,608.65/8,156.86
6. Step 6: Final answer
   x = 8,085.42