Finding the Fourth Proportional to 85,776.57, 128,690.91 and 41,395.05

Step by Step Solution

1. Step 1: Write the proportion equation
   85,776.57 : 128,690.91 = 41,395.05 : x
2. Step 2: Convert to fraction form
   85,776.57/128,690.91 = 41,395.05/x
3. Step 3: Cross multiply
   85,776.57x = 128,690.91 × 41,395.05
4. Step 4: Simplify right side
   85,776.57x = 5,327,166,654.00
5. Step 5: Solve for x
   x = 5,327,166,654.00/85,776.57
6. Step 6: Final answer
   x = 62,105.15