Finding the Fourth Proportional to 666,185.69, 998,918.71 and 345,542.69

Step by Step Solution

1. Step 1: Write the proportion equation
   666,185.69 : 998,918.71 = 345,542.69 : x
2. Step 2: Convert to fraction form
   666,185.69/998,918.71 = 345,542.69/x
3. Step 3: Cross multiply
   666,185.69x = 998,918.71 × 345,542.69
4. Step 4: Simplify right side
   666,185.69x = 345,169,059,778.17
5. Step 5: Solve for x
   x = 345,169,059,778.17/666,185.69
6. Step 6: Final answer
   x = 518,127.40