Finding the Fourth Proportional to 485,096.69, 669,074.83 and 355,991.56

Step by Step Solution

1. Step 1: Write the proportion equation
   485,096.69 : 669,074.83 = 355,991.56 : x
2. Step 2: Convert to fraction form
   485,096.69/669,074.83 = 355,991.56/x
3. Step 3: Cross multiply
   485,096.69x = 669,074.83 × 355,991.56
4. Step 4: Simplify right side
   485,096.69x = 238,184,989,925.77
5. Step 5: Solve for x
   x = 238,184,989,925.77/485,096.69
6. Step 6: Final answer
   x = 491,005.18