Finding the Fourth Proportional to 3,412.72, 5,119.18 and 947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,412.72 : 5,119.18 = 947.72 : x
2. Step 2: Convert to fraction form
   3,412.72/5,119.18 = 947.72/x
3. Step 3: Cross multiply
   3,412.72x = 5,119.18 × 947.72
4. Step 4: Simplify right side
   3,412.72x = 4,851,549.27
5. Step 5: Solve for x
   x = 4,851,549.27/3,412.72
6. Step 6: Final answer
   x = 1,421.61