Finding the Fourth Proportional to 407,085.72, 610,478.82 and 140,777.88

Step by Step Solution

1. Step 1: Write the proportion equation
   407,085.72 : 610,478.82 = 140,777.88 : x
2. Step 2: Convert to fraction form
   407,085.72/610,478.82 = 140,777.88/x
3. Step 3: Cross multiply
   407,085.72x = 610,478.82 × 140,777.88
4. Step 4: Simplify right side
   407,085.72x = 85,941,914,064.50
5. Step 5: Solve for x
   x = 85,941,914,064.50/407,085.72
6. Step 6: Final answer
   x = 211,115.03