Finding the Fourth Proportional to 78,019.70, 107,667.20 and 42,209.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,019.70 : 107,667.20 = 42,209.69 : x
2. Step 2: Convert to fraction form
   78,019.70/107,667.20 = 42,209.69/x
3. Step 3: Cross multiply
   78,019.70x = 107,667.20 × 42,209.69
4. Step 4: Simplify right side
   78,019.70x = 4,544,598,924.12
5. Step 5: Solve for x
   x = 4,544,598,924.12/78,019.70
6. Step 6: Final answer
   x = 58,249.38