Finding the Fourth Proportional to 1,298.17, 1,937.78 and 1,126.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.17 : 1,937.78 = 1,126.05 : x
2. Step 2: Convert to fraction form
   1,298.17/1,937.78 = 1,126.05/x
3. Step 3: Cross multiply
   1,298.17x = 1,937.78 × 1,126.05
4. Step 4: Simplify right side
   1,298.17x = 2,182,037.17
5. Step 5: Solve for x
   x = 2,182,037.17/1,298.17
6. Step 6: Final answer
   x = 1,680.86