Finding the Fourth Proportional to 139,055.58, 191,895.52 and 78,638.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,055.58 : 191,895.52 = 78,638.08 : x
2. Step 2: Convert to fraction form
   139,055.58/191,895.52 = 78,638.08/x
3. Step 3: Cross multiply
   139,055.58x = 191,895.52 × 78,638.08
4. Step 4: Simplify right side
   139,055.58x = 15,090,295,253.40
5. Step 5: Solve for x
   x = 15,090,295,253.40/139,055.58
6. Step 6: Final answer
   x = 108,519.88