Finding the Fourth Proportional to 21,210.72, 29,259 and 19,708.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,210.72 : 29,259 = 19,708.98 : x
2. Step 2: Convert to fraction form
   21,210.72/29,259 = 19,708.98/x
3. Step 3: Cross multiply
   21,210.72x = 29,259 × 19,708.98
4. Step 4: Simplify right side
   21,210.72x = 576,665,045.82
5. Step 5: Solve for x
   x = 576,665,045.82/21,210.72
6. Step 6: Final answer
   x = 27,187.43