Finding the Fourth Proportional to 112,645.20, 155,433 and 64,889.20

Step by Step Solution

1. Step 1: Write the proportion equation
   112,645.20 : 155,433 = 64,889.20 : x
2. Step 2: Convert to fraction form
   112,645.20/155,433 = 64,889.20/x
3. Step 3: Cross multiply
   112,645.20x = 155,433 × 64,889.20
4. Step 4: Simplify right side
   112,645.20x = 10,085,923,023.60
5. Step 5: Solve for x
   x = 10,085,923,023.60/112,645.20
6. Step 6: Final answer
   x = 89,537.09