Finding the Fourth Proportional to 147,826.10, 221,411.10 and 128,143.10

Step by Step Solution

1. Step 1: Write the proportion equation
   147,826.10 : 221,411.10 = 128,143.10 : x
2. Step 2: Convert to fraction form
   147,826.10/221,411.10 = 128,143.10/x
3. Step 3: Cross multiply
   147,826.10x = 221,411.10 × 128,143.10
4. Step 4: Simplify right side
   147,826.10x = 28,372,304,728.41
5. Step 5: Solve for x
   x = 28,372,304,728.41/147,826.10
6. Step 6: Final answer
   x = 191,930.28