Finding the Fourth Proportional to 21,981.78, 32,894.91 and 19,389.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,981.78 : 32,894.91 = 19,389.78 : x
2. Step 2: Convert to fraction form
   21,981.78/32,894.91 = 19,389.78/x
3. Step 3: Cross multiply
   21,981.78x = 32,894.91 × 19,389.78
4. Step 4: Simplify right side
   21,981.78x = 637,825,068.02
5. Step 5: Solve for x
   x = 637,825,068.02/21,981.78
6. Step 6: Final answer
   x = 29,016.08