Finding the Fourth Proportional to 139,570.57, 209,189.08 and 50,720.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,570.57 : 209,189.08 = 50,720.05 : x
2. Step 2: Convert to fraction form
   139,570.57/209,189.08 = 50,720.05/x
3. Step 3: Cross multiply
   139,570.57x = 209,189.08 × 50,720.05
4. Step 4: Simplify right side
   139,570.57x = 10,610,080,597.05
5. Step 5: Solve for x
   x = 10,610,080,597.05/139,570.57
6. Step 6: Final answer
   x = 76,019.47