Finding the Fourth Proportional to 61,379.10, 86,105.70 and 61,379.10

Step by Step Solution

1. Step 1: Write the proportion equation
   61,379.10 : 86,105.70 = 61,379.10 : x
2. Step 2: Convert to fraction form
   61,379.10/86,105.70 = 61,379.10/x
3. Step 3: Cross multiply
   61,379.10x = 86,105.70 × 61,379.10
4. Step 4: Simplify right side
   61,379.10x = 5,285,090,370.87
5. Step 5: Solve for x
   x = 5,285,090,370.87/61,379.10
6. Step 6: Final answer
   x = 86,105.70