Finding the Fourth Proportional to 85,507.89, 128,289.51 and 41,128.86

Step by Step Solution

1. Step 1: Write the proportion equation
   85,507.89 : 128,289.51 = 41,128.86 : x
2. Step 2: Convert to fraction form
   85,507.89/128,289.51 = 41,128.86/x
3. Step 3: Cross multiply
   85,507.89x = 128,289.51 × 41,128.86
4. Step 4: Simplify right side
   85,507.89x = 5,276,401,296.26
5. Step 5: Solve for x
   x = 5,276,401,296.26/85,507.89
6. Step 6: Final answer
   x = 61,706.60