Finding the Fourth Proportional to 271,420.50, 406,715.56 and 145,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   271,420.50 : 406,715.56 = 145,078.72 : x
2. Step 2: Convert to fraction form
   271,420.50/406,715.56 = 145,078.72/x
3. Step 3: Cross multiply
   271,420.50x = 406,715.56 × 145,078.72
4. Step 4: Simplify right side
   271,420.50x = 59,005,772,848.88
5. Step 5: Solve for x
   x = 59,005,772,848.88/271,420.50
6. Step 6: Final answer
   x = 217,396.15