Finding the Fourth Proportional to 42,893.56, 64,362.28 and 20,429.68

Step by Step Solution

1. Step 1: Write the proportion equation
   42,893.56 : 64,362.28 = 20,429.68 : x
2. Step 2: Convert to fraction form
   42,893.56/64,362.28 = 20,429.68/x
3. Step 3: Cross multiply
   42,893.56x = 64,362.28 × 20,429.68
4. Step 4: Simplify right side
   42,893.56x = 1,314,900,784.47
5. Step 5: Solve for x
   x = 1,314,900,784.47/42,893.56
6. Step 6: Final answer
   x = 30,654.97