Finding the Fourth Proportional to 59,769.42, 89,669.25 and 42,921.78

Step by Step Solution

1. Step 1: Write the proportion equation
   59,769.42 : 89,669.25 = 42,921.78 : x
2. Step 2: Convert to fraction form
   59,769.42/89,669.25 = 42,921.78/x
3. Step 3: Cross multiply
   59,769.42x = 89,669.25 × 42,921.78
4. Step 4: Simplify right side
   59,769.42x = 3,848,763,821.27
5. Step 5: Solve for x
   x = 3,848,763,821.27/59,769.42
6. Step 6: Final answer
   x = 64,393.53