Finding the Fourth Proportional to 142,002.40, 212,922.60 and 53,258.80

Step by Step Solution

1. Step 1: Write the proportion equation
   142,002.40 : 212,922.60 = 53,258.80 : x
2. Step 2: Convert to fraction form
   142,002.40/212,922.60 = 53,258.80/x
3. Step 3: Cross multiply
   142,002.40x = 212,922.60 × 53,258.80
4. Step 4: Simplify right side
   142,002.40x = 11,340,002,168.88
5. Step 5: Solve for x
   x = 11,340,002,168.88/142,002.40
6. Step 6: Final answer
   x = 79,857.82