Finding the Fourth Proportional to 42,787.58, 64,212.90 and 20,298.33

Step by Step Solution

1. Step 1: Write the proportion equation
   42,787.58 : 64,212.90 = 20,298.33 : x
2. Step 2: Convert to fraction form
   42,787.58/64,212.90 = 20,298.33/x
3. Step 3: Cross multiply
   42,787.58x = 64,212.90 × 20,298.33
4. Step 4: Simplify right side
   42,787.58x = 1,303,414,634.46
5. Step 5: Solve for x
   x = 1,303,414,634.46/42,787.58
6. Step 6: Final answer
   x = 30,462.45