Finding the Fourth Proportional to 21,991.32, 30,319.47 and 14,019.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,991.32 : 30,319.47 = 14,019.71 : x
2. Step 2: Convert to fraction form
   21,991.32/30,319.47 = 14,019.71/x
3. Step 3: Cross multiply
   21,991.32x = 30,319.47 × 14,019.71
4. Step 4: Simplify right side
   21,991.32x = 425,070,025.16
5. Step 5: Solve for x
   x = 425,070,025.16/21,991.32
6. Step 6: Final answer
   x = 19,328.99