Finding the Fourth Proportional to 3,380.45, 5,070.69 and 1,431.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,380.45 : 5,070.69 = 1,431.59 : x
2. Step 2: Convert to fraction form
   3,380.45/5,070.69 = 1,431.59/x
3. Step 3: Cross multiply
   3,380.45x = 5,070.69 × 1,431.59
4. Step 4: Simplify right side
   3,380.45x = 7,259,123.74
5. Step 5: Solve for x
   x = 7,259,123.74/3,380.45
6. Step 6: Final answer
   x = 2,147.39