Finding the Fourth Proportional to 205,443.63, 307,639.35 and 142,176.15

Step by Step Solution

1. Step 1: Write the proportion equation
   205,443.63 : 307,639.35 = 142,176.15 : x
2. Step 2: Convert to fraction form
   205,443.63/307,639.35 = 142,176.15/x
3. Step 3: Cross multiply
   205,443.63x = 307,639.35 × 142,176.15
4. Step 4: Simplify right side
   205,443.63x = 43,738,978,371.50
5. Step 5: Solve for x
   x = 43,738,978,371.50/205,443.63
6. Step 6: Final answer
   x = 212,900.14