Finding the Fourth Proportional to 147,833.10, 221,421.60 and 128,150.10

Step by Step Solution

1. Step 1: Write the proportion equation
   147,833.10 : 221,421.60 = 128,150.10 : x
2. Step 2: Convert to fraction form
   147,833.10/221,421.60 = 128,150.10/x
3. Step 3: Cross multiply
   147,833.10x = 221,421.60 × 128,150.10
4. Step 4: Simplify right side
   147,833.10x = 28,375,200,182.16
5. Step 5: Solve for x
   x = 28,375,200,182.16/147,833.10
6. Step 6: Final answer
   x = 191,940.78