Finding the Fourth Proportional to 221,081.28, 305,141.28 and 140,493

Step by Step Solution

1. Step 1: Write the proportion equation
   221,081.28 : 305,141.28 = 140,493 : x
2. Step 2: Convert to fraction form
   221,081.28/305,141.28 = 140,493/x
3. Step 3: Cross multiply
   221,081.28x = 305,141.28 × 140,493
4. Step 4: Simplify right side
   221,081.28x = 42,870,213,851.04
5. Step 5: Solve for x
   x = 42,870,213,851.04/221,081.28
6. Step 6: Final answer
   x = 193,911.55