Finding the Fourth Proportional to 85,402.35, 128,181.89 and 43,311.71

Step by Step Solution

1. Step 1: Write the proportion equation
   85,402.35 : 128,181.89 = 43,311.71 : x
2. Step 2: Convert to fraction form
   85,402.35/128,181.89 = 43,311.71/x
3. Step 3: Cross multiply
   85,402.35x = 128,181.89 × 43,311.71
4. Step 4: Simplify right side
   85,402.35x = 5,551,777,275.67
5. Step 5: Solve for x
   x = 5,551,777,275.67/85,402.35
6. Step 6: Final answer
   x = 65,007.31