Finding the Fourth Proportional to 21,003.59, 28,985.70 and 12,052.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.59 : 28,985.70 = 12,052.91 : x
2. Step 2: Convert to fraction form
   21,003.59/28,985.70 = 12,052.91/x
3. Step 3: Cross multiply
   21,003.59x = 28,985.70 × 12,052.91
4. Step 4: Simplify right side
   21,003.59x = 349,362,033.39
5. Step 5: Solve for x
   x = 349,362,033.39/21,003.59
6. Step 6: Final answer
   x = 16,633.44