Finding the Fourth Proportional to 78,318.39, 108,076.48 and 42,507.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,318.39 : 108,076.48 = 42,507.63 : x
2. Step 2: Convert to fraction form
   78,318.39/108,076.48 = 42,507.63/x
3. Step 3: Cross multiply
   78,318.39x = 108,076.48 × 42,507.63
4. Step 4: Simplify right side
   78,318.39x = 4,594,074,917.27
5. Step 5: Solve for x
   x = 4,594,074,917.27/78,318.39
6. Step 6: Final answer
   x = 58,658.96