Finding the Fourth Proportional to 76,623.32, 105,744.94 and 42,639.39

Step by Step Solution

1. Step 1: Write the proportion equation
   76,623.32 : 105,744.94 = 42,639.39 : x
2. Step 2: Convert to fraction form
   76,623.32/105,744.94 = 42,639.39/x
3. Step 3: Cross multiply
   76,623.32x = 105,744.94 × 42,639.39
4. Step 4: Simplify right side
   76,623.32x = 4,508,899,630.59
5. Step 5: Solve for x
   x = 4,508,899,630.59/76,623.32
6. Step 6: Final answer
   x = 58,845.00