Finding the Fourth Proportional to 3,858.72, 5,790.45 and 1,667.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,858.72 : 5,790.45 = 1,667.40 : x
2. Step 2: Convert to fraction form
   3,858.72/5,790.45 = 1,667.40/x
3. Step 3: Cross multiply
   3,858.72x = 5,790.45 × 1,667.40
4. Step 4: Simplify right side
   3,858.72x = 9,654,996.33
5. Step 5: Solve for x
   x = 9,654,996.33/3,858.72
6. Step 6: Final answer
   x = 2,502.12