Finding the Fourth Proportional to 3,420.72, 5,131.38 and 955.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.72 : 5,131.38 = 955.56 : x
2. Step 2: Convert to fraction form
   3,420.72/5,131.38 = 955.56/x
3. Step 3: Cross multiply
   3,420.72x = 5,131.38 × 955.56
4. Step 4: Simplify right side
   3,420.72x = 4,903,341.47
5. Step 5: Solve for x
   x = 4,903,341.47/3,420.72
6. Step 6: Final answer
   x = 1,433.42