Finding the Fourth Proportional to 42,690.72, 64,059.36 and 28,662.46

Step by Step Solution

1. Step 1: Write the proportion equation
   42,690.72 : 64,059.36 = 28,662.46 : x
2. Step 2: Convert to fraction form
   42,690.72/64,059.36 = 28,662.46/x
3. Step 3: Cross multiply
   42,690.72x = 64,059.36 × 28,662.46
4. Step 4: Simplify right side
   42,690.72x = 1,836,098,843.63
5. Step 5: Solve for x
   x = 1,836,098,843.63/42,690.72
6. Step 6: Final answer
   x = 43,009.32