Finding the Fourth Proportional to 112,899.20, 155,821.20 and 65,145.92

Step by Step Solution

1. Step 1: Write the proportion equation
   112,899.20 : 155,821.20 = 65,145.92 : x
2. Step 2: Convert to fraction form
   112,899.20/155,821.20 = 65,145.92/x
3. Step 3: Cross multiply
   112,899.20x = 155,821.20 × 65,145.92
4. Step 4: Simplify right side
   112,899.20x = 10,151,115,429.50
5. Step 5: Solve for x
   x = 10,151,115,429.50/112,899.20
6. Step 6: Final answer
   x = 89,913.09