Finding the Fourth Proportional to 663,422.56, 914,799.62 and 448,188.91

Step by Step Solution

1. Step 1: Write the proportion equation
   663,422.56 : 914,799.62 = 448,188.91 : x
2. Step 2: Convert to fraction form
   663,422.56/914,799.62 = 448,188.91/x
3. Step 3: Cross multiply
   663,422.56x = 914,799.62 × 448,188.91
4. Step 4: Simplify right side
   663,422.56x = 410,003,043,389.69
5. Step 5: Solve for x
   x = 410,003,043,389.69/663,422.56
6. Step 6: Final answer
   x = 618,011.91