Finding the Fourth Proportional to 661,648.96, 912,698.04 and 406,819.72

Step by Step Solution

1. Step 1: Write the proportion equation
   661,648.96 : 912,698.04 = 406,819.72 : x
2. Step 2: Convert to fraction form
   661,648.96/912,698.04 = 406,819.72/x
3. Step 3: Cross multiply
   661,648.96x = 912,698.04 × 406,819.72
4. Step 4: Simplify right side
   661,648.96x = 371,303,561,077.35
5. Step 5: Solve for x
   x = 371,303,561,077.35/661,648.96
6. Step 6: Final answer
   x = 561,179.09