Finding the Fourth Proportional to 64,921.60, 89,644.80 and 41,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,921.60 : 89,644.80 = 41,086.72 : x
2. Step 2: Convert to fraction form
   64,921.60/89,644.80 = 41,086.72/x
3. Step 3: Cross multiply
   64,921.60x = 89,644.80 × 41,086.72
4. Step 4: Simplify right side
   64,921.60x = 3,683,210,797.06
5. Step 5: Solve for x
   x = 3,683,210,797.06/64,921.60
6. Step 6: Final answer
   x = 56,733.21