Finding the Fourth Proportional to 213,820.80, 320,732.55 and 56,047.89

Step by Step Solution

1. Step 1: Write the proportion equation
   213,820.80 : 320,732.55 = 56,047.89 : x
2. Step 2: Convert to fraction form
   213,820.80/320,732.55 = 56,047.89/x
3. Step 3: Cross multiply
   213,820.80x = 320,732.55 × 56,047.89
4. Step 4: Simplify right side
   213,820.80x = 17,976,382,681.82
5. Step 5: Solve for x
   x = 17,976,382,681.82/213,820.80
6. Step 6: Final answer
   x = 84,072.19