Finding the Fourth Proportional to 143,139.30, 200,671.50 and 143,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   143,139.30 : 200,671.50 = 143,139.30 : x
2. Step 2: Convert to fraction form
   143,139.30/200,671.50 = 143,139.30/x
3. Step 3: Cross multiply
   143,139.30x = 200,671.50 × 143,139.30
4. Step 4: Simplify right side
   143,139.30x = 28,723,978,039.95
5. Step 5: Solve for x
   x = 28,723,978,039.95/143,139.30
6. Step 6: Final answer
   x = 200,671.50