Finding the Fourth Proportional to 398,443.89, 549,836.55 and 217,151.94

Step by Step Solution

1. Step 1: Write the proportion equation
   398,443.89 : 549,836.55 = 217,151.94 : x
2. Step 2: Convert to fraction form
   398,443.89/549,836.55 = 217,151.94/x
3. Step 3: Cross multiply
   398,443.89x = 549,836.55 × 217,151.94
4. Step 4: Simplify right side
   398,443.89x = 119,398,069,680.47
5. Step 5: Solve for x
   x = 119,398,069,680.47/398,443.89
6. Step 6: Final answer
   x = 299,660.94