Finding the Fourth Proportional to 213,321.59, 320,000.76 and 55,550.33

Step by Step Solution

1. Step 1: Write the proportion equation
   213,321.59 : 320,000.76 = 55,550.33 : x
2. Step 2: Convert to fraction form
   213,321.59/320,000.76 = 55,550.33/x
3. Step 3: Cross multiply
   213,321.59x = 320,000.76 × 55,550.33
4. Step 4: Simplify right side
   213,321.59x = 17,776,147,818.25
5. Step 5: Solve for x
   x = 17,776,147,818.25/213,321.59
6. Step 6: Final answer
   x = 83,330.28