Finding the Fourth Proportional to 42,801.84, 64,144.44 and 20,613.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,801.84 : 64,144.44 = 20,613.60 : x
2. Step 2: Convert to fraction form
   42,801.84/64,144.44 = 20,613.60/x
3. Step 3: Cross multiply
   42,801.84x = 64,144.44 × 20,613.60
4. Step 4: Simplify right side
   42,801.84x = 1,322,247,828.38
5. Step 5: Solve for x
   x = 1,322,247,828.38/42,801.84
6. Step 6: Final answer
   x = 30,892.31