Finding the Fourth Proportional to 1,172,796.24, 1,618,447.88 and 663,498.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172,796.24 : 1,618,447.88 = 663,498.64 : x
2. Step 2: Convert to fraction form
   1,172,796.24/1,618,447.88 = 663,498.64/x
3. Step 3: Cross multiply
   1,172,796.24x = 1,618,447.88 × 663,498.64
4. Step 4: Simplify right side
   1,172,796.24x = 1,073,837,967,290.88
5. Step 5: Solve for x
   x = 1,073,837,967,290.88/1,172,796.24
6. Step 6: Final answer
   x = 915,621.94