Finding the Fourth Proportional to 142,168.21, 213,068.23 and 57,830.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,168.21 : 213,068.23 = 57,830.47 : x
2. Step 2: Convert to fraction form
   142,168.21/213,068.23 = 57,830.47/x
3. Step 3: Cross multiply
   142,168.21x = 213,068.23 × 57,830.47
4. Step 4: Simplify right side
   142,168.21x = 12,321,835,882.97
5. Step 5: Solve for x
   x = 12,321,835,882.97/142,168.21
6. Step 6: Final answer
   x = 86,670.82