Finding the Fourth Proportional to 21,776.38, 30,052.01 and 12,345.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,776.38 : 30,052.01 = 12,345.55 : x
2. Step 2: Convert to fraction form
   21,776.38/30,052.01 = 12,345.55/x
3. Step 3: Cross multiply
   21,776.38x = 30,052.01 × 12,345.55
4. Step 4: Simplify right side
   21,776.38x = 371,008,592.06
5. Step 5: Solve for x
   x = 371,008,592.06/21,776.38
6. Step 6: Final answer
   x = 17,037.20