Finding the Fourth Proportional to 112,315.72, 154,995.60 and 64,578.40

Step by Step Solution

1. Step 1: Write the proportion equation
   112,315.72 : 154,995.60 = 64,578.40 : x
2. Step 2: Convert to fraction form
   112,315.72/154,995.60 = 64,578.40/x
3. Step 3: Cross multiply
   112,315.72x = 154,995.60 × 64,578.40
4. Step 4: Simplify right side
   112,315.72x = 10,009,367,855.04
5. Step 5: Solve for x
   x = 10,009,367,855.04/112,315.72
6. Step 6: Final answer
   x = 89,118.14