Finding the Fourth Proportional to 660,582.82, 990,757.59 and 261,090.82

Step by Step Solution

1. Step 1: Write the proportion equation
   660,582.82 : 990,757.59 = 261,090.82 : x
2. Step 2: Convert to fraction form
   660,582.82/990,757.59 = 261,090.82/x
3. Step 3: Cross multiply
   660,582.82x = 990,757.59 × 261,090.82
4. Step 4: Simplify right side
   660,582.82x = 258,677,711,594.32
5. Step 5: Solve for x
   x = 258,677,711,594.32/660,582.82
6. Step 6: Final answer
   x = 391,590.13