Finding the Fourth Proportional to 1,173,404.78, 1,619,021.06 and 664,107.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173,404.78 : 1,619,021.06 = 664,107.15 : x
2. Step 2: Convert to fraction form
   1,173,404.78/1,619,021.06 = 664,107.15/x
3. Step 3: Cross multiply
   1,173,404.78x = 1,619,021.06 × 664,107.15
4. Step 4: Simplify right side
   1,173,404.78x = 1,075,203,470,923.38
5. Step 5: Solve for x
   x = 1,075,203,470,923.38/1,173,404.78
6. Step 6: Final answer
   x = 916,310.80