Finding the Fourth Proportional to 28,967.31, 39,978.24 and 17,643.45

Step by Step Solution

1. Step 1: Write the proportion equation
   28,967.31 : 39,978.24 = 17,643.45 : x
2. Step 2: Convert to fraction form
   28,967.31/39,978.24 = 17,643.45/x
3. Step 3: Cross multiply
   28,967.31x = 39,978.24 × 17,643.45
4. Step 4: Simplify right side
   28,967.31x = 705,354,078.53
5. Step 5: Solve for x
   x = 705,354,078.53/28,967.31
6. Step 6: Final answer
   x = 24,350.00