Finding the Fourth Proportional to 78,239.12, 107,969.04 and 42,428.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,239.12 : 107,969.04 = 42,428.70 : x
2. Step 2: Convert to fraction form
   78,239.12/107,969.04 = 42,428.70/x
3. Step 3: Cross multiply
   78,239.12x = 107,969.04 × 42,428.70
4. Step 4: Simplify right side
   78,239.12x = 4,580,986,007.45
5. Step 5: Solve for x
   x = 4,580,986,007.45/78,239.12
6. Step 6: Final answer
   x = 58,551.09