Finding the Fourth Proportional to 21,858.42, 30,164.58 and 12,298.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,858.42 : 30,164.58 = 12,298.32 : x
2. Step 2: Convert to fraction form
   21,858.42/30,164.58 = 12,298.32/x
3. Step 3: Cross multiply
   21,858.42x = 30,164.58 × 12,298.32
4. Step 4: Simplify right side
   21,858.42x = 370,973,657.51
5. Step 5: Solve for x
   x = 370,973,657.51/21,858.42
6. Step 6: Final answer
   x = 16,971.66