Finding the Fourth Proportional to 213,065.15, 319,514.69 and 79,872.75

Step by Step Solution

1. Step 1: Write the proportion equation
   213,065.15 : 319,514.69 = 79,872.75 : x
2. Step 2: Convert to fraction form
   213,065.15/319,514.69 = 79,872.75/x
3. Step 3: Cross multiply
   213,065.15x = 319,514.69 × 79,872.75
4. Step 4: Simplify right side
   213,065.15x = 25,520,517,155.38
5. Step 5: Solve for x
   x = 25,520,517,155.38/213,065.15
6. Step 6: Final answer
   x = 119,778.00