Finding the Fourth Proportional to 112,873.36, 155,765.84 and 65,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   112,873.36 : 155,765.84 = 65,128.72 : x
2. Step 2: Convert to fraction form
   112,873.36/155,765.84 = 65,128.72/x
3. Step 3: Cross multiply
   112,873.36x = 155,765.84 × 65,128.72
4. Step 4: Simplify right side
   112,873.36x = 10,144,829,778.92
5. Step 5: Solve for x
   x = 10,144,829,778.92/112,873.36
6. Step 6: Final answer
   x = 89,877.98