Finding the Fourth Proportional to 139,915.01, 209,870.56 and 79,815.23

Step by Step Solution

1. Step 1: Write the proportion equation
   139,915.01 : 209,870.56 = 79,815.23 : x
2. Step 2: Convert to fraction form
   139,915.01/209,870.56 = 79,815.23/x
3. Step 3: Cross multiply
   139,915.01x = 209,870.56 × 79,815.23
4. Step 4: Simplify right side
   139,915.01x = 16,750,867,016.63
5. Step 5: Solve for x
   x = 16,750,867,016.63/139,915.01
6. Step 6: Final answer
   x = 119,721.73