Finding the Fourth Proportional to 272,214.19, 408,404.18 and 139,187.89

Step by Step Solution

1. Step 1: Write the proportion equation
   272,214.19 : 408,404.18 = 139,187.89 : x
2. Step 2: Convert to fraction form
   272,214.19/408,404.18 = 139,187.89/x
3. Step 3: Cross multiply
   272,214.19x = 408,404.18 × 139,187.89
4. Step 4: Simplify right side
   272,214.19x = 56,844,916,081.38
5. Step 5: Solve for x
   x = 56,844,916,081.38/272,214.19
6. Step 6: Final answer
   x = 208,824.22