Finding the Fourth Proportional to 142,659.47, 213,988.69 and 42,819.23

Step by Step Solution

1. Step 1: Write the proportion equation
   142,659.47 : 213,988.69 = 42,819.23 : x
2. Step 2: Convert to fraction form
   142,659.47/213,988.69 = 42,819.23/x
3. Step 3: Cross multiply
   142,659.47x = 213,988.69 × 42,819.23
4. Step 4: Simplify right side
   142,659.47x = 9,162,830,934.51
5. Step 5: Solve for x
   x = 9,162,830,934.51/142,659.47
6. Step 6: Final answer
   x = 64,228.69