Finding the Fourth Proportional to 107,019.92, 147,688.58 and 64,570.25

Step by Step Solution

1. Step 1: Write the proportion equation
   107,019.92 : 147,688.58 = 64,570.25 : x
2. Step 2: Convert to fraction form
   107,019.92/147,688.58 = 64,570.25/x
3. Step 3: Cross multiply
   107,019.92x = 147,688.58 × 64,570.25
4. Step 4: Simplify right side
   107,019.92x = 9,536,288,532.75
5. Step 5: Solve for x
   x = 9,536,288,532.75/107,019.92
6. Step 6: Final answer
   x = 89,107.60