Finding the Fourth Proportional to 1,290.45, 1,780.82 and 700.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.45 : 1,780.82 = 700.98 : x
2. Step 2: Convert to fraction form
   1,290.45/1,780.82 = 700.98/x
3. Step 3: Cross multiply
   1,290.45x = 1,780.82 × 700.98
4. Step 4: Simplify right side
   1,290.45x = 1,248,311.65
5. Step 5: Solve for x
   x = 1,248,311.65/1,290.45
6. Step 6: Final answer
   x = 967.34