Finding the Fourth Proportional to 369,621.72, 510,075.50 and 208,478.10

Step by Step Solution

1. Step 1: Write the proportion equation
   369,621.72 : 510,075.50 = 208,478.10 : x
2. Step 2: Convert to fraction form
   369,621.72/510,075.50 = 208,478.10/x
3. Step 3: Cross multiply
   369,621.72x = 510,075.50 × 208,478.10
4. Step 4: Simplify right side
   369,621.72x = 106,339,571,096.55
5. Step 5: Solve for x
   x = 106,339,571,096.55/369,621.72
6. Step 6: Final answer
   x = 287,698.38