Finding the Fourth Proportional to 138,408.86, 190,964.72 and 77,958.38

Step by Step Solution

1. Step 1: Write the proportion equation
   138,408.86 : 190,964.72 = 77,958.38 : x
2. Step 2: Convert to fraction form
   138,408.86/190,964.72 = 77,958.38/x
3. Step 3: Cross multiply
   138,408.86x = 190,964.72 × 77,958.38
4. Step 4: Simplify right side
   138,408.86x = 14,887,300,208.35
5. Step 5: Solve for x
   x = 14,887,300,208.35/138,408.86
6. Step 6: Final answer
   x = 107,560.31