Finding the Fourth Proportional to 329,106.72, 493,838.72 and 139,673.64

Step by Step Solution

1. Step 1: Write the proportion equation
   329,106.72 : 493,838.72 = 139,673.64 : x
2. Step 2: Convert to fraction form
   329,106.72/493,838.72 = 139,673.64/x
3. Step 3: Cross multiply
   329,106.72x = 493,838.72 × 139,673.64
4. Step 4: Simplify right side
   329,106.72x = 68,976,251,595.34
5. Step 5: Solve for x
   x = 68,976,251,595.34/329,106.72
6. Step 6: Final answer
   x = 209,586.28