Finding the Fourth Proportional to 42,942.32, 59,189.72 and 28,790.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,942.32 : 59,189.72 = 28,790.64 : x
2. Step 2: Convert to fraction form
   42,942.32/59,189.72 = 28,790.64/x
3. Step 3: Cross multiply
   42,942.32x = 59,189.72 × 28,790.64
4. Step 4: Simplify right side
   42,942.32x = 1,704,109,920.22
5. Step 5: Solve for x
   x = 1,704,109,920.22/42,942.32
6. Step 6: Final answer
   x = 39,683.69