Finding the Fourth Proportional to 21,431.48, 29,574.41 and 11,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,431.48 : 29,574.41 = 11,870.72 : x
2. Step 2: Convert to fraction form
   21,431.48/29,574.41 = 11,870.72/x
3. Step 3: Cross multiply
   21,431.48x = 29,574.41 × 11,870.72
4. Step 4: Simplify right side
   21,431.48x = 351,069,451.50
5. Step 5: Solve for x
   x = 351,069,451.50/21,431.48
6. Step 6: Final answer
   x = 16,381.02