Finding the Fourth Proportional to 139,042.82, 191,871.41 and 78,609.63

Step by Step Solution

1. Step 1: Write the proportion equation
   139,042.82 : 191,871.41 = 78,609.63 : x
2. Step 2: Convert to fraction form
   139,042.82/191,871.41 = 78,609.63/x
3. Step 3: Cross multiply
   139,042.82x = 191,871.41 × 78,609.63
4. Step 4: Simplify right side
   139,042.82x = 15,082,940,154.63
5. Step 5: Solve for x
   x = 15,082,940,154.63/139,042.82
6. Step 6: Final answer
   x = 108,476.94