Finding the Fourth Proportional to 78,084.74, 117,126.72 and 18,920.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,084.74 : 117,126.72 = 18,920.42 : x
2. Step 2: Convert to fraction form
   78,084.74/117,126.72 = 18,920.42/x
3. Step 3: Cross multiply
   78,084.74x = 117,126.72 × 18,920.42
4. Step 4: Simplify right side
   78,084.74x = 2,216,086,735.62
5. Step 5: Solve for x
   x = 2,216,086,735.62/78,084.74
6. Step 6: Final answer
   x = 28,380.54