Finding the Fourth Proportional to 139,715.30, 209,537.94 and 59,713.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,715.30 : 209,537.94 = 59,713.72 : x
2. Step 2: Convert to fraction form
   139,715.30/209,537.94 = 59,713.72/x
3. Step 3: Cross multiply
   139,715.30x = 209,537.94 × 59,713.72
4. Step 4: Simplify right side
   139,715.30x = 12,512,289,878.54
5. Step 5: Solve for x
   x = 12,512,289,878.54/139,715.30
6. Step 6: Final answer
   x = 89,555.62