Finding the Fourth Proportional to 42,786.76, 59,020.98 and 25,779.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,786.76 : 59,020.98 = 25,779.40 : x
2. Step 2: Convert to fraction form
   42,786.76/59,020.98 = 25,779.40/x
3. Step 3: Cross multiply
   42,786.76x = 59,020.98 × 25,779.40
4. Step 4: Simplify right side
   42,786.76x = 1,521,525,451.81
5. Step 5: Solve for x
   x = 1,521,525,451.81/42,786.76
6. Step 6: Final answer
   x = 35,560.66