Finding the Fourth Proportional to 139,781.82, 209,671.74 and 83,637.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,781.82 : 209,671.74 = 83,637.57 : x
2. Step 2: Convert to fraction form
   139,781.82/209,671.74 = 83,637.57/x
3. Step 3: Cross multiply
   139,781.82x = 209,671.74 × 83,637.57
4. Step 4: Simplify right side
   139,781.82x = 17,536,434,831.27
5. Step 5: Solve for x
   x = 17,536,434,831.27/139,781.82
6. Step 6: Final answer
   x = 125,455.76