Finding the Fourth Proportional to 142,087.88, 213,225.94 and 78,090.71

Step by Step Solution

1. Step 1: Write the proportion equation
   142,087.88 : 213,225.94 = 78,090.71 : x
2. Step 2: Convert to fraction form
   142,087.88/213,225.94 = 78,090.71/x
3. Step 3: Cross multiply
   142,087.88x = 213,225.94 × 78,090.71
4. Step 4: Simplify right side
   142,087.88x = 16,650,965,045.02
5. Step 5: Solve for x
   x = 16,650,965,045.02/142,087.88
6. Step 6: Final answer
   x = 117,187.79