Finding the Fourth Proportional to 78,678.05, 108,574.34 and 42,868.35

Step by Step Solution

1. Step 1: Write the proportion equation
   78,678.05 : 108,574.34 = 42,868.35 : x
2. Step 2: Convert to fraction form
   78,678.05/108,574.34 = 42,868.35/x
3. Step 3: Cross multiply
   78,678.05x = 108,574.34 × 42,868.35
4. Step 4: Simplify right side
   78,678.05x = 4,654,402,593.80
5. Step 5: Solve for x
   x = 4,654,402,593.80/78,678.05
6. Step 6: Final answer
   x = 59,157.58