Finding the Fourth Proportional to 64,884.92, 89,499.86 and 57,208.55

Step by Step Solution

1. Step 1: Write the proportion equation
   64,884.92 : 89,499.86 = 57,208.55 : x
2. Step 2: Convert to fraction form
   64,884.92/89,499.86 = 57,208.55/x
3. Step 3: Cross multiply
   64,884.92x = 89,499.86 × 57,208.55
4. Step 4: Simplify right side
   64,884.92x = 5,120,157,153.51
5. Step 5: Solve for x
   x = 5,120,157,153.51/64,884.92
6. Step 6: Final answer
   x = 78,911.35