Finding the Fourth Proportional to 145,218.72, 217,841.52 and 56,478.96

Step by Step Solution

1. Step 1: Write the proportion equation
   145,218.72 : 217,841.52 = 56,478.96 : x
2. Step 2: Convert to fraction form
   145,218.72/217,841.52 = 56,478.96/x
3. Step 3: Cross multiply
   145,218.72x = 217,841.52 × 56,478.96
4. Step 4: Simplify right side
   145,218.72x = 12,303,462,494.42
5. Step 5: Solve for x
   x = 12,303,462,494.42/145,218.72
6. Step 6: Final answer
   x = 84,723.67