Finding the Fourth Proportional to 139,717.30, 209,540.94 and 59,715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,717.30 : 209,540.94 = 59,715.72 : x
2. Step 2: Convert to fraction form
   139,717.30/209,540.94 = 59,715.72/x
3. Step 3: Cross multiply
   139,717.30x = 209,540.94 × 59,715.72
4. Step 4: Simplify right side
   139,717.30x = 12,512,888,101.58
5. Step 5: Solve for x
   x = 12,512,888,101.58/139,717.30
6. Step 6: Final answer
   x = 89,558.62