Finding the Fourth Proportional to 139,233.54, 208,377.18 and 85,959.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,233.54 : 208,377.18 = 85,959.48 : x
2. Step 2: Convert to fraction form
   139,233.54/208,377.18 = 85,959.48/x
3. Step 3: Cross multiply
   139,233.54x = 208,377.18 × 85,959.48
4. Step 4: Simplify right side
   139,233.54x = 17,911,994,036.67
5. Step 5: Solve for x
   x = 17,911,994,036.67/139,233.54
6. Step 6: Final answer
   x = 128,647.12