Finding the Fourth Proportional to 447,085.42, 670,923.59 and 210,495.76

Step by Step Solution

1. Step 1: Write the proportion equation
   447,085.42 : 670,923.59 = 210,495.76 : x
2. Step 2: Convert to fraction form
   447,085.42/670,923.59 = 210,495.76/x
3. Step 3: Cross multiply
   447,085.42x = 670,923.59 × 210,495.76
4. Step 4: Simplify right side
   447,085.42x = 141,226,570,978.98
5. Step 5: Solve for x
   x = 141,226,570,978.98/447,085.42
6. Step 6: Final answer
   x = 315,882.75