Finding the Fourth Proportional to 319,689.57, 479,624.27 and 139,790.82

Step by Step Solution

1. Step 1: Write the proportion equation
   319,689.57 : 479,624.27 = 139,790.82 : x
2. Step 2: Convert to fraction form
   319,689.57/479,624.27 = 139,790.82/x
3. Step 3: Cross multiply
   319,689.57x = 479,624.27 × 139,790.82
4. Step 4: Simplify right side
   319,689.57x = 67,047,069,296.25
5. Step 5: Solve for x
   x = 67,047,069,296.25/319,689.57
6. Step 6: Final answer
   x = 209,725.54