Finding the Fourth Proportional to 42,789.52, 64,184.46 and 28,091.44

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.52 : 64,184.46 = 28,091.44 : x
2. Step 2: Convert to fraction form
   42,789.52/64,184.46 = 28,091.44/x
3. Step 3: Cross multiply
   42,789.52x = 64,184.46 × 28,091.44
4. Step 4: Simplify right side
   42,789.52x = 1,803,033,445.64
5. Step 5: Solve for x
   x = 1,803,033,445.64/42,789.52
6. Step 6: Final answer
   x = 42,137.27