Finding the Fourth Proportional to 58,105.20, 81,243.60 and 58,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   58,105.20 : 81,243.60 = 58,105.20 : x
2. Step 2: Convert to fraction form
   58,105.20/81,243.60 = 58,105.20/x
3. Step 3: Cross multiply
   58,105.20x = 81,243.60 × 58,105.20
4. Step 4: Simplify right side
   58,105.20x = 4,720,675,626.72
5. Step 5: Solve for x
   x = 4,720,675,626.72/58,105.20
6. Step 6: Final answer
   x = 81,243.60