Finding the Fourth Proportional to 42,772, 64,184.72 and 20,587.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,772 : 64,184.72 = 20,587.72 : x
2. Step 2: Convert to fraction form
   42,772/64,184.72 = 20,587.72/x
3. Step 3: Cross multiply
   42,772x = 64,184.72 × 20,587.72
4. Step 4: Simplify right side
   42,772x = 1,321,417,043.64
5. Step 5: Solve for x
   x = 1,321,417,043.64/42,772
6. Step 6: Final answer
   x = 30,894.44