Finding the Fourth Proportional to 109,499.78, 164,036.64 and 71,945.75

Step by Step Solution

1. Step 1: Write the proportion equation
   109,499.78 : 164,036.64 = 71,945.75 : x
2. Step 2: Convert to fraction form
   109,499.78/164,036.64 = 71,945.75/x
3. Step 3: Cross multiply
   109,499.78x = 164,036.64 × 71,945.75
4. Step 4: Simplify right side
   109,499.78x = 11,801,739,502.37
5. Step 5: Solve for x
   x = 11,801,739,502.37/109,499.78
6. Step 6: Final answer
   x = 107,778.66