Finding the Fourth Proportional to 139,990.41, 209,907.72 and 83,087.44

Step by Step Solution

1. Step 1: Write the proportion equation
   139,990.41 : 209,907.72 = 83,087.44 : x
2. Step 2: Convert to fraction form
   139,990.41/209,907.72 = 83,087.44/x
3. Step 3: Cross multiply
   139,990.41x = 209,907.72 × 83,087.44
4. Step 4: Simplify right side
   139,990.41x = 17,440,694,566.27
5. Step 5: Solve for x
   x = 17,440,694,566.27/139,990.41
6. Step 6: Final answer
   x = 124,584.92