Finding the Fourth Proportional to 139,456.22, 209,357.67 and 138,816.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,456.22 : 209,357.67 = 138,816.86 : x
2. Step 2: Convert to fraction form
   139,456.22/209,357.67 = 138,816.86/x
3. Step 3: Cross multiply
   139,456.22x = 209,357.67 × 138,816.86
4. Step 4: Simplify right side
   139,456.22x = 29,062,374,366.32
5. Step 5: Solve for x
   x = 29,062,374,366.32/139,456.22
6. Step 6: Final answer
   x = 208,397.84