Finding the Fourth Proportional to 139,058.80, 191,918.56 and 78,632.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,058.80 : 191,918.56 = 78,632.80 : x
2. Step 2: Convert to fraction form
   139,058.80/191,918.56 = 78,632.80/x
3. Step 3: Cross multiply
   139,058.80x = 191,918.56 × 78,632.80
4. Step 4: Simplify right side
   139,058.80x = 15,091,093,744.77
5. Step 5: Solve for x
   x = 15,091,093,744.77/139,058.80
6. Step 6: Final answer
   x = 108,523.11