Finding the Fourth Proportional to 78,669.63, 117,975.24 and 42,638.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,669.63 : 117,975.24 = 42,638.94 : x
2. Step 2: Convert to fraction form
   78,669.63/117,975.24 = 42,638.94/x
3. Step 3: Cross multiply
   78,669.63x = 117,975.24 × 42,638.94
4. Step 4: Simplify right side
   78,669.63x = 5,030,339,179.85
5. Step 5: Solve for x
   x = 5,030,339,179.85/78,669.63
6. Step 6: Final answer
   x = 63,942.58