Finding the Fourth Proportional to 1,275.98, 1,911.45 and 1,126.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.98 : 1,911.45 = 1,126.10 : x
2. Step 2: Convert to fraction form
   1,275.98/1,911.45 = 1,126.10/x
3. Step 3: Cross multiply
   1,275.98x = 1,911.45 × 1,126.10
4. Step 4: Simplify right side
   1,275.98x = 2,152,483.85
5. Step 5: Solve for x
   x = 2,152,483.85/1,275.98
6. Step 6: Final answer
   x = 1,686.93