Finding the Fourth Proportional to 28,308.72, 42,457.68 and 10,780.32

Step by Step Solution

1. Step 1: Write the proportion equation
   28,308.72 : 42,457.68 = 10,780.32 : x
2. Step 2: Convert to fraction form
   28,308.72/42,457.68 = 10,780.32/x
3. Step 3: Cross multiply
   28,308.72x = 42,457.68 × 10,780.32
4. Step 4: Simplify right side
   28,308.72x = 457,707,376.86
5. Step 5: Solve for x
   x = 457,707,376.86/28,308.72
6. Step 6: Final answer
   x = 16,168.42