Finding the Fourth Proportional to 196,128.48, 270,333.85 and 138,693.72

Step by Step Solution

1. Step 1: Write the proportion equation
   196,128.48 : 270,333.85 = 138,693.72 : x
2. Step 2: Convert to fraction form
   196,128.48/270,333.85 = 138,693.72/x
3. Step 3: Cross multiply
   196,128.48x = 270,333.85 × 138,693.72
4. Step 4: Simplify right side
   196,128.48x = 37,493,607,298.42
5. Step 5: Solve for x
   x = 37,493,607,298.42/196,128.48
6. Step 6: Final answer
   x = 191,168.60