Finding the Fourth Proportional to 78,084.50, 117,126.34 and 18,920.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,084.50 : 117,126.34 = 18,920.18 : x
2. Step 2: Convert to fraction form
   78,084.50/117,126.34 = 18,920.18/x
3. Step 3: Cross multiply
   78,084.50x = 117,126.34 × 18,920.18
4. Step 4: Simplify right side
   78,084.50x = 2,216,051,435.54
5. Step 5: Solve for x
   x = 2,216,051,435.54/78,084.50
6. Step 6: Final answer
   x = 28,380.17