Finding the Fourth Proportional to 78,749.29, 108,673.76 and 42,939.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,749.29 : 108,673.76 = 42,939.21 : x
2. Step 2: Convert to fraction form
   78,749.29/108,673.76 = 42,939.21/x
3. Step 3: Cross multiply
   78,749.29x = 108,673.76 × 42,939.21
4. Step 4: Simplify right side
   78,749.29x = 4,666,365,917.00
5. Step 5: Solve for x
   x = 4,666,365,917.00/78,749.29
6. Step 6: Final answer
   x = 59,255.97