Finding the Fourth Proportional to 272,191.05, 408,369.57 and 139,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   272,191.05 : 408,369.57 = 139,164.72 : x
2. Step 2: Convert to fraction form
   272,191.05/408,369.57 = 139,164.72/x
3. Step 3: Cross multiply
   272,191.05x = 408,369.57 × 139,164.72
4. Step 4: Simplify right side
   272,191.05x = 56,830,636,865.57
5. Step 5: Solve for x
   x = 56,830,636,865.57/272,191.05
6. Step 6: Final answer
   x = 208,789.51