Finding the Fourth Proportional to 139,427.16, 209,048.28 and 50,670.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,427.16 : 209,048.28 = 50,670.12 : x
2. Step 2: Convert to fraction form
   139,427.16/209,048.28 = 50,670.12/x
3. Step 3: Cross multiply
   139,427.16x = 209,048.28 × 50,670.12
4. Step 4: Simplify right side
   139,427.16x = 10,592,501,433.39
5. Step 5: Solve for x
   x = 10,592,501,433.39/139,427.16
6. Step 6: Final answer
   x = 75,971.58