Finding the Fourth Proportional to 142,754.01, 213,897.41 and 86,423.39

Step by Step Solution

1. Step 1: Write the proportion equation
   142,754.01 : 213,897.41 = 86,423.39 : x
2. Step 2: Convert to fraction form
   142,754.01/213,897.41 = 86,423.39/x
3. Step 3: Cross multiply
   142,754.01x = 213,897.41 × 86,423.39
4. Step 4: Simplify right side
   142,754.01x = 18,485,737,782.82
5. Step 5: Solve for x
   x = 18,485,737,782.82/142,754.01
6. Step 6: Final answer
   x = 129,493.65