Finding the Fourth Proportional to 431,061.20, 646,503.48 and 271,063.76

Step by Step Solution

1. Step 1: Write the proportion equation
   431,061.20 : 646,503.48 = 271,063.76 : x
2. Step 2: Convert to fraction form
   431,061.20/646,503.48 = 271,063.76/x
3. Step 3: Cross multiply
   431,061.20x = 646,503.48 × 271,063.76
4. Step 4: Simplify right side
   431,061.20x = 175,243,664,141.89
5. Step 5: Solve for x
   x = 175,243,664,141.89/431,061.20
6. Step 6: Final answer
   x = 406,540.10