Finding the Fourth Proportional to 2,487.30, 3,430.71 and 2,111.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.30 : 3,430.71 = 2,111.69 : x
2. Step 2: Convert to fraction form
   2,487.30/3,430.71 = 2,111.69/x
3. Step 3: Cross multiply
   2,487.30x = 3,430.71 × 2,111.69
4. Step 4: Simplify right side
   2,487.30x = 7,244,596.00
5. Step 5: Solve for x
   x = 7,244,596.00/2,487.30
6. Step 6: Final answer
   x = 2,912.64