Finding the Fourth Proportional to 3,899.56, 5,380.72 and 3,702.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.56 : 5,380.72 = 3,702.56 : x
2. Step 2: Convert to fraction form
   3,899.56/5,380.72 = 3,702.56/x
3. Step 3: Cross multiply
   3,899.56x = 5,380.72 × 3,702.56
4. Step 4: Simplify right side
   3,899.56x = 19,922,438.64
5. Step 5: Solve for x
   x = 19,922,438.64/3,899.56
6. Step 6: Final answer
   x = 5,108.89