Finding the Fourth Proportional to 85,399.80, 128,136.15 and 41,003.70

Step by Step Solution

1. Step 1: Write the proportion equation
   85,399.80 : 128,136.15 = 41,003.70 : x
2. Step 2: Convert to fraction form
   85,399.80/128,136.15 = 41,003.70/x
3. Step 3: Cross multiply
   85,399.80x = 128,136.15 × 41,003.70
4. Step 4: Simplify right side
   85,399.80x = 5,254,056,253.76
5. Step 5: Solve for x
   x = 5,254,056,253.76/85,399.80
6. Step 6: Final answer
   x = 61,523.05