Finding the Fourth Proportional to 21,789.16, 30,070.54 and 12,358.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.16 : 30,070.54 = 12,358.34 : x
2. Step 2: Convert to fraction form
   21,789.16/30,070.54 = 12,358.34/x
3. Step 3: Cross multiply
   21,789.16x = 30,070.54 × 12,358.34
4. Step 4: Simplify right side
   21,789.16x = 371,621,957.30
5. Step 5: Solve for x
   x = 371,621,957.30/21,789.16
6. Step 6: Final answer
   x = 17,055.36