Finding the Fourth Proportional to 78,112.75, 107,795.42 and 42,302.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,112.75 : 107,795.42 = 42,302.65 : x
2. Step 2: Convert to fraction form
   78,112.75/107,795.42 = 42,302.65/x
3. Step 3: Cross multiply
   78,112.75x = 107,795.42 × 42,302.65
4. Step 4: Simplify right side
   78,112.75x = 4,560,031,173.37
5. Step 5: Solve for x
   x = 4,560,031,173.37/78,112.75
6. Step 6: Final answer
   x = 58,377.56