Finding the Fourth Proportional to 42,782.54, 64,146.47 and 20,551.69

Step by Step Solution

1. Step 1: Write the proportion equation
   42,782.54 : 64,146.47 = 20,551.69 : x
2. Step 2: Convert to fraction form
   42,782.54/64,146.47 = 20,551.69/x
3. Step 3: Cross multiply
   42,782.54x = 64,146.47 × 20,551.69
4. Step 4: Simplify right side
   42,782.54x = 1,318,318,045.30
5. Step 5: Solve for x
   x = 1,318,318,045.30/42,782.54
6. Step 6: Final answer
   x = 30,814.39