Finding the Fourth Proportional to 21,917.06, 30,245.46 and 12,357.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,917.06 : 30,245.46 = 12,357.98 : x
2. Step 2: Convert to fraction form
   21,917.06/30,245.46 = 12,357.98/x
3. Step 3: Cross multiply
   21,917.06x = 30,245.46 × 12,357.98
4. Step 4: Simplify right side
   21,917.06x = 373,772,638.54
5. Step 5: Solve for x
   x = 373,772,638.54/21,917.06
6. Step 6: Final answer
   x = 17,053.96