Finding the Fourth Proportional to 100,933.92, 139,139.37 and 64,631.34

Step by Step Solution

1. Step 1: Write the proportion equation
   100,933.92 : 139,139.37 = 64,631.34 : x
2. Step 2: Convert to fraction form
   100,933.92/139,139.37 = 64,631.34/x
3. Step 3: Cross multiply
   100,933.92x = 139,139.37 × 64,631.34
4. Step 4: Simplify right side
   100,933.92x = 8,992,763,929.86
5. Step 5: Solve for x
   x = 8,992,763,929.86/100,933.92
6. Step 6: Final answer
   x = 89,095.56