Finding the Fourth Proportional to 64,890.38, 89,467.58 and 54,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,890.38 : 89,467.58 = 54,150.72 : x
2. Step 2: Convert to fraction form
   64,890.38/89,467.58 = 54,150.72/x
3. Step 3: Cross multiply
   64,890.38x = 89,467.58 × 54,150.72
4. Step 4: Simplify right side
   64,890.38x = 4,844,734,009.03
5. Step 5: Solve for x
   x = 4,844,734,009.03/64,890.38
6. Step 6: Final answer
   x = 74,660.29