Finding the Fourth Proportional to 42,659.16, 64,010.34 and 28,779

Step by Step Solution

1. Step 1: Write the proportion equation
   42,659.16 : 64,010.34 = 28,779 : x
2. Step 2: Convert to fraction form
   42,659.16/64,010.34 = 28,779/x
3. Step 3: Cross multiply
   42,659.16x = 64,010.34 × 28,779
4. Step 4: Simplify right side
   42,659.16x = 1,842,153,574.86
5. Step 5: Solve for x
   x = 1,842,153,574.86/42,659.16
6. Step 6: Final answer
   x = 43,183.07