Finding the Fourth Proportional to 28,758.72, 43,185.60 and 21,738.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,758.72 : 43,185.60 = 21,738.72 : x
2. Step 2: Convert to fraction form
   28,758.72/43,185.60 = 21,738.72/x
3. Step 3: Cross multiply
   28,758.72x = 43,185.60 × 21,738.72
4. Step 4: Simplify right side
   28,758.72x = 938,799,666.43
5. Step 5: Solve for x
   x = 938,799,666.43/28,758.72
6. Step 6: Final answer
   x = 32,644.00