Finding the Fourth Proportional to 100,757.58, 139,043.55 and 55,434.43

Step by Step Solution

1. Step 1: Write the proportion equation
   100,757.58 : 139,043.55 = 55,434.43 : x
2. Step 2: Convert to fraction form
   100,757.58/139,043.55 = 55,434.43/x
3. Step 3: Cross multiply
   100,757.58x = 139,043.55 × 55,434.43
4. Step 4: Simplify right side
   100,757.58x = 7,707,799,939.43
5. Step 5: Solve for x
   x = 7,707,799,939.43/100,757.58
6. Step 6: Final answer
   x = 76,498.46