Finding the Fourth Proportional to 252,105.27, 378,156.51 and 145,420.05

Step by Step Solution

1. Step 1: Write the proportion equation
   252,105.27 : 378,156.51 = 145,420.05 : x
2. Step 2: Convert to fraction form
   252,105.27/378,156.51 = 145,420.05/x
3. Step 3: Cross multiply
   252,105.27x = 378,156.51 × 145,420.05
4. Step 4: Simplify right side
   252,105.27x = 54,991,538,592.03
5. Step 5: Solve for x
   x = 54,991,538,592.03/252,105.27
6. Step 6: Final answer
   x = 218,129.27