Finding the Fourth Proportional to 139,055.94, 191,896.04 and 78,638.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,055.94 : 191,896.04 = 78,638.46 : x
2. Step 2: Convert to fraction form
   139,055.94/191,896.04 = 78,638.46/x
3. Step 3: Cross multiply
   139,055.94x = 191,896.04 × 78,638.46
4. Step 4: Simplify right side
   139,055.94x = 15,090,409,065.70
5. Step 5: Solve for x
   x = 15,090,409,065.70/139,055.94
6. Step 6: Final answer
   x = 108,520.42