Finding the Fourth Proportional to 1,665.77, 2,498.70 and 1,276.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.77 : 2,498.70 = 1,276.48 : x
2. Step 2: Convert to fraction form
   1,665.77/2,498.70 = 1,276.48/x
3. Step 3: Cross multiply
   1,665.77x = 2,498.70 × 1,276.48
4. Step 4: Simplify right side
   1,665.77x = 3,189,527.25
5. Step 5: Solve for x
   x = 3,189,527.25/1,665.77
6. Step 6: Final answer
   x = 1,914.75