Finding the Fourth Proportional to 139,570.70, 209,357.33 and 39,730.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,570.70 : 209,357.33 = 39,730.88 : x
2. Step 2: Convert to fraction form
   139,570.70/209,357.33 = 39,730.88/x
3. Step 3: Cross multiply
   139,570.70x = 209,357.33 × 39,730.88
4. Step 4: Simplify right side
   139,570.70x = 8,317,951,026.50
5. Step 5: Solve for x
   x = 8,317,951,026.50/139,570.70
6. Step 6: Final answer
   x = 59,596.69