Finding the Fourth Proportional to 78,521.35, 108,361.25 and 42,713.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,521.35 : 108,361.25 = 42,713.28 : x
2. Step 2: Convert to fraction form
   78,521.35/108,361.25 = 42,713.28/x
3. Step 3: Cross multiply
   78,521.35x = 108,361.25 × 42,713.28
4. Step 4: Simplify right side
   78,521.35x = 4,628,464,412.40
5. Step 5: Solve for x
   x = 4,628,464,412.40/78,521.35
6. Step 6: Final answer
   x = 58,945.30