Finding the Fourth Proportional to 39,189.32, 54,081.90 and 21,284.33

Step by Step Solution

1. Step 1: Write the proportion equation
   39,189.32 : 54,081.90 = 21,284.33 : x
2. Step 2: Convert to fraction form
   39,189.32/54,081.90 = 21,284.33/x
3. Step 3: Cross multiply
   39,189.32x = 54,081.90 × 21,284.33
4. Step 4: Simplify right side
   39,189.32x = 1,151,097,141.83
5. Step 5: Solve for x
   x = 1,151,097,141.83/39,189.32
6. Step 6: Final answer
   x = 29,372.73