Finding the Fourth Proportional to 369,757.86, 510,265.89 and 199,991.99

Step by Step Solution

1. Step 1: Write the proportion equation
   369,757.86 : 510,265.89 = 199,991.99 : x
2. Step 2: Convert to fraction form
   369,757.86/510,265.89 = 199,991.99/x
3. Step 3: Cross multiply
   369,757.86x = 510,265.89 × 199,991.99
4. Step 4: Simplify right side
   369,757.86x = 102,049,088,218.89
5. Step 5: Solve for x
   x = 102,049,088,218.89/369,757.86
6. Step 6: Final answer
   x = 275,988.96