Finding the Fourth Proportional to 680,665.47, 1,021,629.74 and 343,942.59

Step by Step Solution

1. Step 1: Write the proportion equation
   680,665.47 : 1,021,629.74 = 343,942.59 : x
2. Step 2: Convert to fraction form
   680,665.47/1,021,629.74 = 343,942.59/x
3. Step 3: Cross multiply
   680,665.47x = 1,021,629.74 × 343,942.59
4. Step 4: Simplify right side
   680,665.47x = 351,381,978,796.63
5. Step 5: Solve for x
   x = 351,381,978,796.63/680,665.47
6. Step 6: Final answer
   x = 516,233.00