Finding the Fourth Proportional to 911,705.34, 1,367,575.61 and 280,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   911,705.34 : 1,367,575.61 = 280,618.50 : x
2. Step 2: Convert to fraction form
   911,705.34/1,367,575.61 = 280,618.50/x
3. Step 3: Cross multiply
   911,705.34x = 1,367,575.61 × 280,618.50
4. Step 4: Simplify right side
   911,705.34x = 383,767,014,911.69
5. Step 5: Solve for x
   x = 383,767,014,911.69/911,705.34
6. Step 6: Final answer
   x = 420,933.17