Finding the Fourth Proportional to 78,428.09, 117,575.98 and 34,021.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,428.09 : 117,575.98 = 34,021.42 : x
2. Step 2: Convert to fraction form
   78,428.09/117,575.98 = 34,021.42/x
3. Step 3: Cross multiply
   78,428.09x = 117,575.98 × 34,021.42
4. Step 4: Simplify right side
   78,428.09x = 4,000,101,797.49
5. Step 5: Solve for x
   x = 4,000,101,797.49/78,428.09
6. Step 6: Final answer
   x = 51,003.43