Finding the Fourth Proportional to 2,114.57, 3,170.72 and 1,238.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,114.57 : 3,170.72 = 1,238.78 : x
2. Step 2: Convert to fraction form
   2,114.57/3,170.72 = 1,238.78/x
3. Step 3: Cross multiply
   2,114.57x = 3,170.72 × 1,238.78
4. Step 4: Simplify right side
   2,114.57x = 3,927,802.47
5. Step 5: Solve for x
   x = 3,927,802.47/2,114.57
6. Step 6: Final answer
   x = 1,857.50