Finding the Fourth Proportional to 85,925.67, 128,871.81 and 43,219.71

Step by Step Solution

1. Step 1: Write the proportion equation
   85,925.67 : 128,871.81 = 43,219.71 : x
2. Step 2: Convert to fraction form
   85,925.67/128,871.81 = 43,219.71/x
3. Step 3: Cross multiply
   85,925.67x = 128,871.81 × 43,219.71
4. Step 4: Simplify right side
   85,925.67x = 5,569,802,900.72
5. Step 5: Solve for x
   x = 5,569,802,900.72/85,925.67
6. Step 6: Final answer
   x = 64,821.18