Finding the Fourth Proportional to 92,978.78, 139,409.73 and 67,687.34

Step by Step Solution

1. Step 1: Write the proportion equation
   92,978.78 : 139,409.73 = 67,687.34 : x
2. Step 2: Convert to fraction form
   92,978.78/139,409.73 = 67,687.34/x
3. Step 3: Cross multiply
   92,978.78x = 139,409.73 × 67,687.34
4. Step 4: Simplify right side
   92,978.78x = 9,436,273,793.82
5. Step 5: Solve for x
   x = 9,436,273,793.82/92,978.78
6. Step 6: Final answer
   x = 101,488.47