Finding the Fourth Proportional to 139,854.72, 209,787.84 and 73,257.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,854.72 : 209,787.84 = 73,257.60 : x
2. Step 2: Convert to fraction form
   139,854.72/209,787.84 = 73,257.60/x
3. Step 3: Cross multiply
   139,854.72x = 209,787.84 × 73,257.60
4. Step 4: Simplify right side
   139,854.72x = 15,368,553,667.58
5. Step 5: Solve for x
   x = 15,368,553,667.58/139,854.72
6. Step 6: Final answer
   x = 109,889.42