Finding the Fourth Proportional to 272,189.05, 408,366.57 and 139,162.72

Step by Step Solution

1. Step 1: Write the proportion equation
   272,189.05 : 408,366.57 = 139,162.72 : x
2. Step 2: Convert to fraction form
   272,189.05/408,366.57 = 139,162.72/x
3. Step 3: Cross multiply
   272,189.05x = 408,366.57 × 139,162.72
4. Step 4: Simplify right side
   272,189.05x = 56,829,402,638.27
5. Step 5: Solve for x
   x = 56,829,402,638.27/272,189.05
6. Step 6: Final answer
   x = 208,786.51