Finding the Fourth Proportional to 454,687.48, 682,131.12 and 139,168.72

Step by Step Solution

1. Step 1: Write the proportion equation
   454,687.48 : 682,131.12 = 139,168.72 : x
2. Step 2: Convert to fraction form
   454,687.48/682,131.12 = 139,168.72/x
3. Step 3: Cross multiply
   454,687.48x = 682,131.12 × 139,168.72
4. Step 4: Simplify right side
   454,687.48x = 94,931,314,842.57
5. Step 5: Solve for x
   x = 94,931,314,842.57/454,687.48
6. Step 6: Final answer
   x = 208,783.66