Finding the Fourth Proportional to 64,817.75, 89,465.41 and 42,218.75

Step by Step Solution

1. Step 1: Write the proportion equation
   64,817.75 : 89,465.41 = 42,218.75 : x
2. Step 2: Convert to fraction form
   64,817.75/89,465.41 = 42,218.75/x
3. Step 3: Cross multiply
   64,817.75x = 89,465.41 × 42,218.75
4. Step 4: Simplify right side
   64,817.75x = 3,777,118,054.87
5. Step 5: Solve for x
   x = 3,777,118,054.87/64,817.75
6. Step 6: Final answer
   x = 58,272.89