Finding the Fourth Proportional to 139,038.26, 191,871.77 and 78,608.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,038.26 : 191,871.77 = 78,608.75 : x
2. Step 2: Convert to fraction form
   139,038.26/191,871.77 = 78,608.75/x
3. Step 3: Cross multiply
   139,038.26x = 191,871.77 × 78,608.75
4. Step 4: Simplify right side
   139,038.26x = 15,082,798,647.58
5. Step 5: Solve for x
   x = 15,082,798,647.58/139,038.26
6. Step 6: Final answer
   x = 108,479.49