Finding the Fourth Proportional to 139,429.16, 209,051.28 and 50,672.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,429.16 : 209,051.28 = 50,672.12 : x
2. Step 2: Convert to fraction form
   139,429.16/209,051.28 = 50,672.12/x
3. Step 3: Cross multiply
   139,429.16x = 209,051.28 × 50,672.12
4. Step 4: Simplify right side
   139,429.16x = 10,593,071,546.31
5. Step 5: Solve for x
   x = 10,593,071,546.31/139,429.16
6. Step 6: Final answer
   x = 75,974.58