Finding the Fourth Proportional to 3,420.42, 5,130.72 and 955.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.42 : 5,130.72 = 955.50 : x
2. Step 2: Convert to fraction form
   3,420.42/5,130.72 = 955.50/x
3. Step 3: Cross multiply
   3,420.42x = 5,130.72 × 955.50
4. Step 4: Simplify right side
   3,420.42x = 4,902,402.96
5. Step 5: Solve for x
   x = 4,902,402.96/3,420.42
6. Step 6: Final answer
   x = 1,433.28