Finding the Fourth Proportional to 455,391, 683,173.98 and 206,073

Step by Step Solution

1. Step 1: Write the proportion equation
   455,391 : 683,173.98 = 206,073 : x
2. Step 2: Convert to fraction form
   455,391/683,173.98 = 206,073/x
3. Step 3: Cross multiply
   455,391x = 683,173.98 × 206,073
4. Step 4: Simplify right side
   455,391x = 140,783,711,580.54
5. Step 5: Solve for x
   x = 140,783,711,580.54/455,391
6. Step 6: Final answer
   x = 309,149.09