Finding the Fourth Proportional to 2,172.12, 3,255.72 and 1,248.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.12 : 3,255.72 = 1,248.12 : x
2. Step 2: Convert to fraction form
   2,172.12/3,255.72 = 1,248.12/x
3. Step 3: Cross multiply
   2,172.12x = 3,255.72 × 1,248.12
4. Step 4: Simplify right side
   2,172.12x = 4,063,529.25
5. Step 5: Solve for x
   x = 4,063,529.25/2,172.12
6. Step 6: Final answer
   x = 1,870.77