Finding the Fourth Proportional to 64,624.89, 89,250.33 and 57,580.45

Step by Step Solution

1. Step 1: Write the proportion equation
   64,624.89 : 89,250.33 = 57,580.45 : x
2. Step 2: Convert to fraction form
   64,624.89/89,250.33 = 57,580.45/x
3. Step 3: Cross multiply
   64,624.89x = 89,250.33 × 57,580.45
4. Step 4: Simplify right side
   64,624.89x = 5,139,074,164.05
5. Step 5: Solve for x
   x = 5,139,074,164.05/64,624.89
6. Step 6: Final answer
   x = 79,521.59