Finding the Fourth Proportional to 21,088.51, 31,773.34 and 19,089.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,088.51 : 31,773.34 = 19,089.61 : x
2. Step 2: Convert to fraction form
   21,088.51/31,773.34 = 19,089.61/x
3. Step 3: Cross multiply
   21,088.51x = 31,773.34 × 19,089.61
4. Step 4: Simplify right side
   21,088.51x = 606,540,669.00
5. Step 5: Solve for x
   x = 606,540,669.00/21,088.51
6. Step 6: Final answer
   x = 28,761.67