Finding the Fourth Proportional to 2,160.35, 2,980.55 and 1,415.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.35 : 2,980.55 = 1,415.15 : x
2. Step 2: Convert to fraction form
   2,160.35/2,980.55 = 1,415.15/x
3. Step 3: Cross multiply
   2,160.35x = 2,980.55 × 1,415.15
4. Step 4: Simplify right side
   2,160.35x = 4,217,918.26
5. Step 5: Solve for x
   x = 4,217,918.26/2,160.35
6. Step 6: Final answer
   x = 1,952.42