Finding the Fourth Proportional to 660,196.80, 990,663.05 and 356,584.82

Step by Step Solution

1. Step 1: Write the proportion equation
   660,196.80 : 990,663.05 = 356,584.82 : x
2. Step 2: Convert to fraction form
   660,196.80/990,663.05 = 356,584.82/x
3. Step 3: Cross multiply
   660,196.80x = 990,663.05 × 356,584.82
4. Step 4: Simplify right side
   660,196.80x = 353,255,401,303.05
5. Step 5: Solve for x
   x = 353,255,401,303.05/660,196.80
6. Step 6: Final answer
   x = 535,075.91