Finding the Fourth Proportional to 68,789.72, 103,184.72 and 18,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,789.72 : 103,184.72 = 18,870.50 : x
2. Step 2: Convert to fraction form
   68,789.72/103,184.72 = 18,870.50/x
3. Step 3: Cross multiply
   68,789.72x = 103,184.72 × 18,870.50
4. Step 4: Simplify right side
   68,789.72x = 1,947,147,493.13
5. Step 5: Solve for x
   x = 1,947,147,493.13/68,789.72
6. Step 6: Final answer
   x = 28,305.79