Finding the Fourth Proportional to 398,155.50, 549,454.59 and 219,307.50

Step by Step Solution

1. Step 1: Write the proportion equation
   398,155.50 : 549,454.59 = 219,307.50 : x
2. Step 2: Convert to fraction form
   398,155.50/549,454.59 = 219,307.50/x
3. Step 3: Cross multiply
   398,155.50x = 549,454.59 × 219,307.50
4. Step 4: Simplify right side
   398,155.50x = 120,499,512,496.43
5. Step 5: Solve for x
   x = 120,499,512,496.43/398,155.50
6. Step 6: Final answer
   x = 302,644.35