Finding the Fourth Proportional to 1,290.01, 1,780.30 and 730.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.01 : 1,780.30 = 730.48 : x
2. Step 2: Convert to fraction form
   1,290.01/1,780.30 = 730.48/x
3. Step 3: Cross multiply
   1,290.01x = 1,780.30 × 730.48
4. Step 4: Simplify right side
   1,290.01x = 1,300,464.64
5. Step 5: Solve for x
   x = 1,300,464.64/1,290.01
6. Step 6: Final answer
   x = 1,008.10