Finding the Fourth Proportional to 147,838.10, 221,429.10 and 128,155.10

Step by Step Solution

1. Step 1: Write the proportion equation
   147,838.10 : 221,429.10 = 128,155.10 : x
2. Step 2: Convert to fraction form
   147,838.10/221,429.10 = 128,155.10/x
3. Step 3: Cross multiply
   147,838.10x = 221,429.10 × 128,155.10
4. Step 4: Simplify right side
   147,838.10x = 28,377,268,453.41
5. Step 5: Solve for x
   x = 28,377,268,453.41/147,838.10
6. Step 6: Final answer
   x = 191,948.28