Finding the Fourth Proportional to 28,451.18, 42,644.94 and 10,664.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,451.18 : 42,644.94 = 10,664.72 : x
2. Step 2: Convert to fraction form
   28,451.18/42,644.94 = 10,664.72/x
3. Step 3: Cross multiply
   28,451.18x = 42,644.94 × 10,664.72
4. Step 4: Simplify right side
   28,451.18x = 454,796,131.29
5. Step 5: Solve for x
   x = 454,796,131.29/28,451.18
6. Step 6: Final answer
   x = 15,985.14