Finding the Fourth Proportional to 1,290.02, 1,779.15 and 969.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.02 : 1,779.15 = 969.57 : x
2. Step 2: Convert to fraction form
   1,290.02/1,779.15 = 969.57/x
3. Step 3: Cross multiply
   1,290.02x = 1,779.15 × 969.57
4. Step 4: Simplify right side
   1,290.02x = 1,724,996.72
5. Step 5: Solve for x
   x = 1,724,996.72/1,290.02
6. Step 6: Final answer
   x = 1,337.19