Finding the Fourth Proportional to 139,990.22, 209,986.14 and 34,809.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,990.22 : 209,986.14 = 34,809.20 : x
2. Step 2: Convert to fraction form
   139,990.22/209,986.14 = 34,809.20/x
3. Step 3: Cross multiply
   139,990.22x = 209,986.14 × 34,809.20
4. Step 4: Simplify right side
   139,990.22x = 7,309,448,494.56
5. Step 5: Solve for x
   x = 7,309,448,494.56/139,990.22
6. Step 6: Final answer
   x = 52,214.00