Finding the Fourth Proportional to 213,429.72, 320,144.52 and 55,657.74

Step by Step Solution

1. Step 1: Write the proportion equation
   213,429.72 : 320,144.52 = 55,657.74 : x
2. Step 2: Convert to fraction form
   213,429.72/320,144.52 = 55,657.74/x
3. Step 3: Cross multiply
   213,429.72x = 320,144.52 × 55,657.74
4. Step 4: Simplify right side
   213,429.72x = 17,818,520,456.58
5. Step 5: Solve for x
   x = 17,818,520,456.58/213,429.72
6. Step 6: Final answer
   x = 83,486.59