Finding the Fourth Proportional to 139,549.69, 192,594.81 and 78,312.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,549.69 : 192,594.81 = 78,312.75 : x
2. Step 2: Convert to fraction form
   139,549.69/192,594.81 = 78,312.75/x
3. Step 3: Cross multiply
   139,549.69x = 192,594.81 × 78,312.75
4. Step 4: Simplify right side
   139,549.69x = 15,082,629,206.83
5. Step 5: Solve for x
   x = 15,082,629,206.83/139,549.69
6. Step 6: Final answer
   x = 108,080.71