Finding the Fourth Proportional to 21,758.94, 30,019.95 and 12,803.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,758.94 : 30,019.95 = 12,803.58 : x
2. Step 2: Convert to fraction form
   21,758.94/30,019.95 = 12,803.58/x
3. Step 3: Cross multiply
   21,758.94x = 30,019.95 × 12,803.58
4. Step 4: Simplify right side
   21,758.94x = 384,362,831.42
5. Step 5: Solve for x
   x = 384,362,831.42/21,758.94
6. Step 6: Final answer
   x = 17,664.59