Finding the Fourth Proportional to 13,710.50, 18,920.50 and 7,422.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,710.50 : 18,920.50 = 7,422.88 : x
2. Step 2: Convert to fraction form
   13,710.50/18,920.50 = 7,422.88/x
3. Step 3: Cross multiply
   13,710.50x = 18,920.50 × 7,422.88
4. Step 4: Simplify right side
   13,710.50x = 140,444,601.04
5. Step 5: Solve for x
   x = 140,444,601.04/13,710.50
6. Step 6: Final answer
   x = 10,243.58