Finding the Fourth Proportional to 3,613.35, 5,420.38 and 980.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.35 : 5,420.38 = 980.89 : x
2. Step 2: Convert to fraction form
   3,613.35/5,420.38 = 980.89/x
3. Step 3: Cross multiply
   3,613.35x = 5,420.38 × 980.89
4. Step 4: Simplify right side
   3,613.35x = 5,316,796.54
5. Step 5: Solve for x
   x = 5,316,796.54/3,613.35
6. Step 6: Final answer
   x = 1,471.43