Finding the Fourth Proportional to 42,826.02, 59,120.62 and 28,509.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,826.02 : 59,120.62 = 28,509.72 : x
2. Step 2: Convert to fraction form
   42,826.02/59,120.62 = 28,509.72/x
3. Step 3: Cross multiply
   42,826.02x = 59,120.62 × 28,509.72
4. Step 4: Simplify right side
   42,826.02x = 1,685,512,322.43
5. Step 5: Solve for x
   x = 1,685,512,322.43/42,826.02
6. Step 6: Final answer
   x = 39,357.20