Finding the Fourth Proportional to 424,210.22, 636,338.82 and 139,889.30

Step by Step Solution

1. Step 1: Write the proportion equation
   424,210.22 : 636,338.82 = 139,889.30 : x
2. Step 2: Convert to fraction form
   424,210.22/636,338.82 = 139,889.30/x
3. Step 3: Cross multiply
   424,210.22x = 636,338.82 × 139,889.30
4. Step 4: Simplify right side
   424,210.22x = 89,016,992,092.63
5. Step 5: Solve for x
   x = 89,016,992,092.63/424,210.22
6. Step 6: Final answer
   x = 209,841.70