Finding the Fourth Proportional to 139,446.08, 209,159.52 and 80,238.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,446.08 : 209,159.52 = 80,238.08 : x
2. Step 2: Convert to fraction form
   139,446.08/209,159.52 = 80,238.08/x
3. Step 3: Cross multiply
   139,446.08x = 209,159.52 × 80,238.08
4. Step 4: Simplify right side
   139,446.08x = 16,782,558,298.52
5. Step 5: Solve for x
   x = 16,782,558,298.52/139,446.08
6. Step 6: Final answer
   x = 120,351.60