Finding the Fourth Proportional to 78,107.40, 107,786.88 and 42,297.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78,107.40 : 107,786.88 = 42,297.12 : x
2. Step 2: Convert to fraction form
   78,107.40/107,786.88 = 42,297.12/x
3. Step 3: Cross multiply
   78,107.40x = 107,786.88 × 42,297.12
4. Step 4: Simplify right side
   78,107.40x = 4,559,074,597.79
5. Step 5: Solve for x
   x = 4,559,074,597.79/78,107.40
6. Step 6: Final answer
   x = 58,369.30