Finding the Fourth Proportional to 78,238.88, 107,968.62 and 42,428.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,238.88 : 107,968.62 = 42,428.70 : x
2. Step 2: Convert to fraction form
   78,238.88/107,968.62 = 42,428.70/x
3. Step 3: Cross multiply
   78,238.88x = 107,968.62 × 42,428.70
4. Step 4: Simplify right side
   78,238.88x = 4,580,968,187.39
5. Step 5: Solve for x
   x = 4,580,968,187.39/78,238.88
6. Step 6: Final answer
   x = 58,551.05