Finding the Fourth Proportional to 1,290.06, 1,780.28 and 700.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.06 : 1,780.28 = 700.59 : x
2. Step 2: Convert to fraction form
   1,290.06/1,780.28 = 700.59/x
3. Step 3: Cross multiply
   1,290.06x = 1,780.28 × 700.59
4. Step 4: Simplify right side
   1,290.06x = 1,247,242.86
5. Step 5: Solve for x
   x = 1,247,242.86/1,290.06
6. Step 6: Final answer
   x = 966.81