Finding the Fourth Proportional to 687,258, 948,830.76 and 449,208.72

Step by Step Solution

1. Step 1: Write the proportion equation
   687,258 : 948,830.76 = 449,208.72 : x
2. Step 2: Convert to fraction form
   687,258/948,830.76 = 449,208.72/x
3. Step 3: Cross multiply
   687,258x = 948,830.76 × 449,208.72
4. Step 4: Simplify right side
   687,258x = 426,223,051,196.23
5. Step 5: Solve for x
   x = 426,223,051,196.23/687,258
6. Step 6: Final answer
   x = 620,179.10