Finding the Fourth Proportional to 5,105.30, 7,643.55 and 4,961.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,105.30 : 7,643.55 = 4,961.30 : x
2. Step 2: Convert to fraction form
   5,105.30/7,643.55 = 4,961.30/x
3. Step 3: Cross multiply
   5,105.30x = 7,643.55 × 4,961.30
4. Step 4: Simplify right side
   5,105.30x = 37,921,944.62
5. Step 5: Solve for x
   x = 37,921,944.62/5,105.30
6. Step 6: Final answer
   x = 7,427.96