Finding the Fourth Proportional to 142,140.40, 213,210.18 and 57,880.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,140.40 : 213,210.18 = 57,880.72 : x
2. Step 2: Convert to fraction form
   142,140.40/213,210.18 = 57,880.72/x
3. Step 3: Cross multiply
   142,140.40x = 213,210.18 × 57,880.72
4. Step 4: Simplify right side
   142,140.40x = 12,340,758,729.73
5. Step 5: Solve for x
   x = 12,340,758,729.73/142,140.40
6. Step 6: Final answer
   x = 86,820.91