Finding the Fourth Proportional to 42,754.42, 64,145.46 and 20,564.90

Step by Step Solution

1. Step 1: Write the proportion equation
   42,754.42 : 64,145.46 = 20,564.90 : x
2. Step 2: Convert to fraction form
   42,754.42/64,145.46 = 20,564.90/x
3. Step 3: Cross multiply
   42,754.42x = 64,145.46 × 20,564.90
4. Step 4: Simplify right side
   42,754.42x = 1,319,144,967.29
5. Step 5: Solve for x
   x = 1,319,144,967.29/42,754.42
6. Step 6: Final answer
   x = 30,854.00