Finding the Fourth Proportional to 21,098.17, 31,468.42 and 17,788.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,098.17 : 31,468.42 = 17,788.28 : x
2. Step 2: Convert to fraction form
   21,098.17/31,468.42 = 17,788.28/x
3. Step 3: Cross multiply
   21,098.17x = 31,468.42 × 17,788.28
4. Step 4: Simplify right side
   21,098.17x = 559,769,246.56
5. Step 5: Solve for x
   x = 559,769,246.56/21,098.17
6. Step 6: Final answer
   x = 26,531.65