Finding the Fourth Proportional to 2,164.89, 3,245.15 and 1,385.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.89 : 3,245.15 = 1,385.78 : x
2. Step 2: Convert to fraction form
   2,164.89/3,245.15 = 1,385.78/x
3. Step 3: Cross multiply
   2,164.89x = 3,245.15 × 1,385.78
4. Step 4: Simplify right side
   2,164.89x = 4,497,040.81
5. Step 5: Solve for x
   x = 4,497,040.81/2,164.89
6. Step 6: Final answer
   x = 2,077.26