Finding the Fourth Proportional to 272,617.49, 409,009.59 and 139,591.83

Step by Step Solution

1. Step 1: Write the proportion equation
   272,617.49 : 409,009.59 = 139,591.83 : x
2. Step 2: Convert to fraction form
   272,617.49/409,009.59 = 139,591.83/x
3. Step 3: Cross multiply
   272,617.49x = 409,009.59 × 139,591.83
4. Step 4: Simplify right side
   272,617.49x = 57,094,397,155.65
5. Step 5: Solve for x
   x = 57,094,397,155.65/272,617.49
6. Step 6: Final answer
   x = 209,430.43