Finding the Fourth Proportional to 2,188.42, 3,283.54 and 1,312.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.42 : 3,283.54 = 1,312.61 : x
2. Step 2: Convert to fraction form
   2,188.42/3,283.54 = 1,312.61/x
3. Step 3: Cross multiply
   2,188.42x = 3,283.54 × 1,312.61
4. Step 4: Simplify right side
   2,188.42x = 4,309,987.74
5. Step 5: Solve for x
   x = 4,309,987.74/2,188.42
6. Step 6: Final answer
   x = 1,969.45