Finding the Fourth Proportional to 704,003.56, 971,518.94 and 398,140

Step by Step Solution

1. Step 1: Write the proportion equation
   704,003.56 : 971,518.94 = 398,140 : x
2. Step 2: Convert to fraction form
   704,003.56/971,518.94 = 398,140/x
3. Step 3: Cross multiply
   704,003.56x = 971,518.94 × 398,140
4. Step 4: Simplify right side
   704,003.56x = 386,800,550,771.60
5. Step 5: Solve for x
   x = 386,800,550,771.60/704,003.56
6. Step 6: Final answer
   x = 549,429.82