Finding the Fourth Proportional to 155,809.24, 215,379.98 and 138,980.27

Step by Step Solution

1. Step 1: Write the proportion equation
   155,809.24 : 215,379.98 = 138,980.27 : x
2. Step 2: Convert to fraction form
   155,809.24/215,379.98 = 138,980.27/x
3. Step 3: Cross multiply
   155,809.24x = 215,379.98 × 138,980.27
4. Step 4: Simplify right side
   155,809.24x = 29,933,568,137.72
5. Step 5: Solve for x
   x = 29,933,568,137.72/155,809.24
6. Step 6: Final answer
   x = 192,116.77