Finding the Fourth Proportional to 145,123.20, 217,601.00 and 56,272.91

Step by Step Solution

1. Step 1: Write the proportion equation
   145,123.20 : 217,601.00 = 56,272.91 : x
2. Step 2: Convert to fraction form
   145,123.20/217,601.00 = 56,272.91/x
3. Step 3: Cross multiply
   145,123.20x = 217,601.00 × 56,272.91
4. Step 4: Simplify right side
   145,123.20x = 12,245,040,119.54
5. Step 5: Solve for x
   x = 12,245,040,119.54/145,123.20
6. Step 6: Final answer
   x = 84,376.86