Finding the Fourth Proportional to 2,100.56, 3,151.68 and 1,126.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.56 : 3,151.68 = 1,126.40 : x
2. Step 2: Convert to fraction form
   2,100.56/3,151.68 = 1,126.40/x
3. Step 3: Cross multiply
   2,100.56x = 3,151.68 × 1,126.40
4. Step 4: Simplify right side
   2,100.56x = 3,550,052.35
5. Step 5: Solve for x
   x = 3,550,052.35/2,100.56
6. Step 6: Final answer
   x = 1,690.05