Finding the Fourth Proportional to 213,558.03, 320,340.15 and 55,786.50

Step by Step Solution

1. Step 1: Write the proportion equation
   213,558.03 : 320,340.15 = 55,786.50 : x
2. Step 2: Convert to fraction form
   213,558.03/320,340.15 = 55,786.50/x
3. Step 3: Cross multiply
   213,558.03x = 320,340.15 × 55,786.50
4. Step 4: Simplify right side
   213,558.03x = 17,870,655,777.98
5. Step 5: Solve for x
   x = 17,870,655,777.98/213,558.03
6. Step 6: Final answer
   x = 83,680.56