Finding the Fourth Proportional to 139,459.50, 209,191.86 and 39,620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,459.50 : 209,191.86 = 39,620.10 : x
2. Step 2: Convert to fraction form
   139,459.50/209,191.86 = 39,620.10/x
3. Step 3: Cross multiply
   139,459.50x = 209,191.86 × 39,620.10
4. Step 4: Simplify right side
   139,459.50x = 8,288,202,412.39
5. Step 5: Solve for x
   x = 8,288,202,412.39/139,459.50
6. Step 6: Final answer
   x = 59,430.89