Finding the Fourth Proportional to 8,311.32, 12,437.72 and 5,192.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,311.32 : 12,437.72 = 5,192.80 : x
2. Step 2: Convert to fraction form
   8,311.32/12,437.72 = 5,192.80/x
3. Step 3: Cross multiply
   8,311.32x = 12,437.72 × 5,192.80
4. Step 4: Simplify right side
   8,311.32x = 64,586,592.42
5. Step 5: Solve for x
   x = 64,586,592.42/8,311.32
6. Step 6: Final answer
   x = 7,770.92