Finding the Fourth Proportional to 100,758.69, 139,043.97 and 55,436.58

Step by Step Solution

1. Step 1: Write the proportion equation
   100,758.69 : 139,043.97 = 55,436.58 : x
2. Step 2: Convert to fraction form
   100,758.69/139,043.97 = 55,436.58/x
3. Step 3: Cross multiply
   100,758.69x = 139,043.97 × 55,436.58
4. Step 4: Simplify right side
   100,758.69x = 7,708,122,166.42
5. Step 5: Solve for x
   x = 7,708,122,166.42/100,758.69
6. Step 6: Final answer
   x = 76,500.82