Finding the Fourth Proportional to 30,964.42, 42,748.60 and 20,384.81

Step by Step Solution

1. Step 1: Write the proportion equation
   30,964.42 : 42,748.60 = 20,384.81 : x
2. Step 2: Convert to fraction form
   30,964.42/42,748.60 = 20,384.81/x
3. Step 3: Cross multiply
   30,964.42x = 42,748.60 × 20,384.81
4. Step 4: Simplify right side
   30,964.42x = 871,421,875.02
5. Step 5: Solve for x
   x = 871,421,875.02/30,964.42
6. Step 6: Final answer
   x = 28,142.69