Finding the Fourth Proportional to 78,705.12, 108,609.89 and 42,894.36

Step by Step Solution

1. Step 1: Write the proportion equation
   78,705.12 : 108,609.89 = 42,894.36 : x
2. Step 2: Convert to fraction form
   78,705.12/108,609.89 = 42,894.36/x
3. Step 3: Cross multiply
   78,705.12x = 108,609.89 × 42,894.36
4. Step 4: Simplify right side
   78,705.12x = 4,658,751,506.75
5. Step 5: Solve for x
   x = 4,658,751,506.75/78,705.12
6. Step 6: Final answer
   x = 59,192.48