Finding the Fourth Proportional to 21,820.02, 30,112.47 and 12,389.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.02 : 30,112.47 = 12,389.46 : x
2. Step 2: Convert to fraction form
   21,820.02/30,112.47 = 12,389.46/x
3. Step 3: Cross multiply
   21,820.02x = 30,112.47 × 12,389.46
4. Step 4: Simplify right side
   21,820.02x = 373,077,242.57
5. Step 5: Solve for x
   x = 373,077,242.57/21,820.02
6. Step 6: Final answer
   x = 17,097.93