Finding the Fourth Proportional to 78,708.05, 108,619.38 and 42,900.38

Step by Step Solution

1. Step 1: Write the proportion equation
   78,708.05 : 108,619.38 = 42,900.38 : x
2. Step 2: Convert to fraction form
   78,708.05/108,619.38 = 42,900.38/x
3. Step 3: Cross multiply
   78,708.05x = 108,619.38 × 42,900.38
4. Step 4: Simplify right side
   78,708.05x = 4,659,812,134.27
5. Step 5: Solve for x
   x = 4,659,812,134.27/78,708.05
6. Step 6: Final answer
   x = 59,203.76