Finding the Fourth Proportional to 143,456, 197,969.28 and 83,840

Step by Step Solution

1. Step 1: Write the proportion equation
   143,456 : 197,969.28 = 83,840 : x
2. Step 2: Convert to fraction form
   143,456/197,969.28 = 83,840/x
3. Step 3: Cross multiply
   143,456x = 197,969.28 × 83,840
4. Step 4: Simplify right side
   143,456x = 16,597,744,435.20
5. Step 5: Solve for x
   x = 16,597,744,435.20/143,456
6. Step 6: Final answer
   x = 115,699.20