Finding the Fourth Proportional to 112,971.10, 155,894.50 and 64,571.57

Step by Step Solution

1. Step 1: Write the proportion equation
   112,971.10 : 155,894.50 = 64,571.57 : x
2. Step 2: Convert to fraction form
   112,971.10/155,894.50 = 64,571.57/x
3. Step 3: Cross multiply
   112,971.10x = 155,894.50 × 64,571.57
4. Step 4: Simplify right side
   112,971.10x = 10,066,352,847.67
5. Step 5: Solve for x
   x = 10,066,352,847.67/112,971.10
6. Step 6: Final answer
   x = 89,105.56