Finding the Fourth Proportional to 213,109.42, 319,409.92 and 99,103.33

Step by Step Solution

1. Step 1: Write the proportion equation
   213,109.42 : 319,409.92 = 99,103.33 : x
2. Step 2: Convert to fraction form
   213,109.42/319,409.92 = 99,103.33/x
3. Step 3: Cross multiply
   213,109.42x = 319,409.92 × 99,103.33
4. Step 4: Simplify right side
   213,109.42x = 31,654,586,086.01
5. Step 5: Solve for x
   x = 31,654,586,086.01/213,109.42
6. Step 6: Final answer
   x = 148,536.78