Finding the Fourth Proportional to 407,139.72, 610,751.47 and 140,899.83

Step by Step Solution

1. Step 1: Write the proportion equation
   407,139.72 : 610,751.47 = 140,899.83 : x
2. Step 2: Convert to fraction form
   407,139.72/610,751.47 = 140,899.83/x
3. Step 3: Cross multiply
   407,139.72x = 610,751.47 × 140,899.83
4. Step 4: Simplify right side
   407,139.72x = 86,054,778,295.25
5. Step 5: Solve for x
   x = 86,054,778,295.25/407,139.72
6. Step 6: Final answer
   x = 211,364.24