Finding the Fourth Proportional to 1,290.01, 1,780.23 and 700.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.01 : 1,780.23 = 700.56 : x
2. Step 2: Convert to fraction form
   1,290.01/1,780.23 = 700.56/x
3. Step 3: Cross multiply
   1,290.01x = 1,780.23 × 700.56
4. Step 4: Simplify right side
   1,290.01x = 1,247,149.03
5. Step 5: Solve for x
   x = 1,247,149.03/1,290.01
6. Step 6: Final answer
   x = 966.77