Finding the Fourth Proportional to 1,290.42, 1,780.82 and 700.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.42 : 1,780.82 = 700.95 : x
2. Step 2: Convert to fraction form
   1,290.42/1,780.82 = 700.95/x
3. Step 3: Cross multiply
   1,290.42x = 1,780.82 × 700.95
4. Step 4: Simplify right side
   1,290.42x = 1,248,262.27
5. Step 5: Solve for x
   x = 1,248,262.27/1,290.42
6. Step 6: Final answer
   x = 967.33