Finding the Fourth Proportional to 139,653.96, 209,487.72 and 39,821.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,653.96 : 209,487.72 = 39,821.10 : x
2. Step 2: Convert to fraction form
   139,653.96/209,487.72 = 39,821.10/x
3. Step 3: Cross multiply
   139,653.96x = 209,487.72 × 39,821.10
4. Step 4: Simplify right side
   139,653.96x = 8,342,031,446.89
5. Step 5: Solve for x
   x = 8,342,031,446.89/139,653.96
6. Step 6: Final answer
   x = 59,733.58