Finding the Fourth Proportional to 85,471.76, 128,171.64 and 34,856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,471.76 : 128,171.64 = 34,856.72 : x
2. Step 2: Convert to fraction form
   85,471.76/128,171.64 = 34,856.72/x
3. Step 3: Cross multiply
   85,471.76x = 128,171.64 × 34,856.72
4. Step 4: Simplify right side
   85,471.76x = 4,467,642,967.42
5. Step 5: Solve for x
   x = 4,467,642,967.42/85,471.76
6. Step 6: Final answer
   x = 52,270.40