Finding the Fourth Proportional to 36,225, 49,990.64 and 21,128.09

Step by Step Solution

1. Step 1: Write the proportion equation
   36,225 : 49,990.64 = 21,128.09 : x
2. Step 2: Convert to fraction form
   36,225/49,990.64 = 21,128.09/x
3. Step 3: Cross multiply
   36,225x = 49,990.64 × 21,128.09
4. Step 4: Simplify right side
   36,225x = 1,056,206,385.48
5. Step 5: Solve for x
   x = 1,056,206,385.48/36,225
6. Step 6: Final answer
   x = 29,156.84