Finding the Fourth Proportional to 67,640.58, 93,381.54 and 40,789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   67,640.58 : 93,381.54 = 40,789.89 : x
2. Step 2: Convert to fraction form
   67,640.58/93,381.54 = 40,789.89/x
3. Step 3: Cross multiply
   67,640.58x = 93,381.54 × 40,789.89
4. Step 4: Simplify right side
   67,640.58x = 3,809,022,744.63
5. Step 5: Solve for x
   x = 3,809,022,744.63/67,640.58
6. Step 6: Final answer
   x = 56,312.69