Finding the Fourth Proportional to 78,215.09, 107,936.88 and 42,405.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78,215.09 : 107,936.88 = 42,405.25 : x
2. Step 2: Convert to fraction form
   78,215.09/107,936.88 = 42,405.25/x
3. Step 3: Cross multiply
   78,215.09x = 107,936.88 × 42,405.25
4. Step 4: Simplify right side
   78,215.09x = 4,577,089,969.83
5. Step 5: Solve for x
   x = 4,577,089,969.83/78,215.09
6. Step 6: Final answer
   x = 58,519.27