Finding the Fourth Proportional to 64,910.20, 91,005.50 and 64,910.20

Step by Step Solution

1. Step 1: Write the proportion equation
   64,910.20 : 91,005.50 = 64,910.20 : x
2. Step 2: Convert to fraction form
   64,910.20/91,005.50 = 64,910.20/x
3. Step 3: Cross multiply
   64,910.20x = 91,005.50 × 64,910.20
4. Step 4: Simplify right side
   64,910.20x = 5,907,185,206.10
5. Step 5: Solve for x
   x = 5,907,185,206.10/64,910.20
6. Step 6: Final answer
   x = 91,005.50