Finding the Fourth Proportional to 42,956.09, 64,350.33 and 28,120.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,956.09 : 64,350.33 = 28,120.03 : x
2. Step 2: Convert to fraction form
   42,956.09/64,350.33 = 28,120.03/x
3. Step 3: Cross multiply
   42,956.09x = 64,350.33 × 28,120.03
4. Step 4: Simplify right side
   42,956.09x = 1,809,533,149.95
5. Step 5: Solve for x
   x = 1,809,533,149.95/42,956.09
6. Step 6: Final answer
   x = 42,125.18