Finding the Fourth Proportional to 78,147.77, 107,843.78 and 42,338.75

Step by Step Solution

1. Step 1: Write the proportion equation
   78,147.77 : 107,843.78 = 42,338.75 : x
2. Step 2: Convert to fraction form
   78,147.77/107,843.78 = 42,338.75/x
3. Step 3: Cross multiply
   78,147.77x = 107,843.78 × 42,338.75
4. Step 4: Simplify right side
   78,147.77x = 4,565,970,628.78
5. Step 5: Solve for x
   x = 4,565,970,628.78/78,147.77
6. Step 6: Final answer
   x = 58,427.40