Finding the Fourth Proportional to 870,198.72, 1,200,855.63 and 482,991.58

Step by Step Solution

1. Step 1: Write the proportion equation
   870,198.72 : 1,200,855.63 = 482,991.58 : x
2. Step 2: Convert to fraction form
   870,198.72/1,200,855.63 = 482,991.58/x
3. Step 3: Cross multiply
   870,198.72x = 1,200,855.63 × 482,991.58
4. Step 4: Simplify right side
   870,198.72x = 580,003,162,058.46
5. Step 5: Solve for x
   x = 580,003,162,058.46/870,198.72
6. Step 6: Final answer
   x = 666,518.06