Finding the Fourth Proportional to 10,364.42, 15,533.67 and 5,171.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,364.42 : 15,533.67 = 5,171.78 : x
2. Step 2: Convert to fraction form
   10,364.42/15,533.67 = 5,171.78/x
3. Step 3: Cross multiply
   10,364.42x = 15,533.67 × 5,171.78
4. Step 4: Simplify right side
   10,364.42x = 80,336,723.83
5. Step 5: Solve for x
   x = 80,336,723.83/10,364.42
6. Step 6: Final answer
   x = 7,751.20