Finding the Fourth Proportional to 105,213.60, 145,043.73 and 64,900.17

Step by Step Solution

1. Step 1: Write the proportion equation
   105,213.60 : 145,043.73 = 64,900.17 : x
2. Step 2: Convert to fraction form
   105,213.60/145,043.73 = 64,900.17/x
3. Step 3: Cross multiply
   105,213.60x = 145,043.73 × 64,900.17
4. Step 4: Simplify right side
   105,213.60x = 9,413,362,734.43
5. Step 5: Solve for x
   x = 9,413,362,734.43/105,213.60
6. Step 6: Final answer
   x = 89,469.07