Finding the Fourth Proportional to 78,091.36, 107,765.92 and 42,281.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,091.36 : 107,765.92 = 42,281.40 : x
2. Step 2: Convert to fraction form
   78,091.36/107,765.92 = 42,281.40/x
3. Step 3: Cross multiply
   78,091.36x = 107,765.92 × 42,281.40
4. Step 4: Simplify right side
   78,091.36x = 4,556,493,969.89
5. Step 5: Solve for x
   x = 4,556,493,969.89/78,091.36
6. Step 6: Final answer
   x = 58,348.25