Finding the Fourth Proportional to 13,989.30, 19,306.71 and 8,019.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,989.30 : 19,306.71 = 8,019.78 : x
2. Step 2: Convert to fraction form
   13,989.30/19,306.71 = 8,019.78/x
3. Step 3: Cross multiply
   13,989.30x = 19,306.71 × 8,019.78
4. Step 4: Simplify right side
   13,989.30x = 154,835,566.72
5. Step 5: Solve for x
   x = 154,835,566.72/13,989.30
6. Step 6: Final answer
   x = 11,068.14