Finding the Fourth Proportional to 2,188.90, 3,020.71 and 1,292.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.90 : 3,020.71 = 1,292.67 : x
2. Step 2: Convert to fraction form
   2,188.90/3,020.71 = 1,292.67/x
3. Step 3: Cross multiply
   2,188.90x = 3,020.71 × 1,292.67
4. Step 4: Simplify right side
   2,188.90x = 3,904,781.20
5. Step 5: Solve for x
   x = 3,904,781.20/2,188.90
6. Step 6: Final answer
   x = 1,783.90