Finding the Fourth Proportional to 142,406.68, 213,621.42 and 42,559.60

Step by Step Solution

1. Step 1: Write the proportion equation
   142,406.68 : 213,621.42 = 42,559.60 : x
2. Step 2: Convert to fraction form
   142,406.68/213,621.42 = 42,559.60/x
3. Step 3: Cross multiply
   142,406.68x = 213,621.42 × 42,559.60
4. Step 4: Simplify right side
   142,406.68x = 9,091,642,186.63
5. Step 5: Solve for x
   x = 9,091,642,186.63/142,406.68
6. Step 6: Final answer
   x = 63,842.81