Finding the Fourth Proportional to 64,845, 89,427.86 and 55,319.24

Step by Step Solution

1. Step 1: Write the proportion equation
   64,845 : 89,427.86 = 55,319.24 : x
2. Step 2: Convert to fraction form
   64,845/89,427.86 = 55,319.24/x
3. Step 3: Cross multiply
   64,845x = 89,427.86 × 55,319.24
4. Step 4: Simplify right side
   64,845x = 4,947,081,250.03
5. Step 5: Solve for x
   x = 4,947,081,250.03/64,845
6. Step 6: Final answer
   x = 76,290.87