Finding the Fourth Proportional to 2,077.04, 2,864.64 and 1,290.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,077.04 : 2,864.64 = 1,290.56 : x
2. Step 2: Convert to fraction form
   2,077.04/2,864.64 = 1,290.56/x
3. Step 3: Cross multiply
   2,077.04x = 2,864.64 × 1,290.56
4. Step 4: Simplify right side
   2,077.04x = 3,696,989.80
5. Step 5: Solve for x
   x = 3,696,989.80/2,077.04
6. Step 6: Final answer
   x = 1,779.93