Finding the Fourth Proportional to 2,100.16, 3,150.06 and 1,278.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.16 : 3,150.06 = 1,278.22 : x
2. Step 2: Convert to fraction form
   2,100.16/3,150.06 = 1,278.22/x
3. Step 3: Cross multiply
   2,100.16x = 3,150.06 × 1,278.22
4. Step 4: Simplify right side
   2,100.16x = 4,026,469.69
5. Step 5: Solve for x
   x = 4,026,469.69/2,100.16
6. Step 6: Final answer
   x = 1,917.22