Finding the Fourth Proportional to 7,776.42, 10,731.72 and 4,239.74

Step by Step Solution

1. Step 1: Write the proportion equation
   7,776.42 : 10,731.72 = 4,239.74 : x
2. Step 2: Convert to fraction form
   7,776.42/10,731.72 = 4,239.74/x
3. Step 3: Cross multiply
   7,776.42x = 10,731.72 × 4,239.74
4. Step 4: Simplify right side
   7,776.42x = 45,499,702.55
5. Step 5: Solve for x
   x = 45,499,702.55/7,776.42
6. Step 6: Final answer
   x = 5,850.98