Finding the Fourth Proportional to 78,039.50, 107,694.79 and 42,229.51

Step by Step Solution

1. Step 1: Write the proportion equation
   78,039.50 : 107,694.79 = 42,229.51 : x
2. Step 2: Convert to fraction form
   78,039.50/107,694.79 = 42,229.51/x
3. Step 3: Cross multiply
   78,039.50x = 107,694.79 × 42,229.51
4. Step 4: Simplify right side
   78,039.50x = 4,547,898,030.94
5. Step 5: Solve for x
   x = 4,547,898,030.94/78,039.50
6. Step 6: Final answer
   x = 58,276.87