Finding the Fourth Proportional to 85,741.28, 128,615.86 and 41,405.32

Step by Step Solution

1. Step 1: Write the proportion equation
   85,741.28 : 128,615.86 = 41,405.32 : x
2. Step 2: Convert to fraction form
   85,741.28/128,615.86 = 41,405.32/x
3. Step 3: Cross multiply
   85,741.28x = 128,615.86 × 41,405.32
4. Step 4: Simplify right side
   85,741.28x = 5,325,380,840.38
5. Step 5: Solve for x
   x = 5,325,380,840.38/85,741.28
6. Step 6: Final answer
   x = 62,109.88