Finding the Fourth Proportional to 139,446.27, 209,255.27 and 55,192.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,446.27 : 209,255.27 = 55,192.10 : x
2. Step 2: Convert to fraction form
   139,446.27/209,255.27 = 55,192.10/x
3. Step 3: Cross multiply
   139,446.27x = 209,255.27 × 55,192.10
4. Step 4: Simplify right side
   139,446.27x = 11,549,236,465.13
5. Step 5: Solve for x
   x = 11,549,236,465.13/139,446.27
6. Step 6: Final answer
   x = 82,822.13