Finding the Fourth Proportional to 69,019.40, 103,638.45 and 50,429.90

Step by Step Solution

1. Step 1: Write the proportion equation
   69,019.40 : 103,638.45 = 50,429.90 : x
2. Step 2: Convert to fraction form
   69,019.40/103,638.45 = 50,429.90/x
3. Step 3: Cross multiply
   69,019.40x = 103,638.45 × 50,429.90
4. Step 4: Simplify right side
   69,019.40x = 5,226,476,669.66
5. Step 5: Solve for x
   x = 5,226,476,669.66/69,019.40
6. Step 6: Final answer
   x = 75,724.75