Finding the Fourth Proportional to 145,200.12, 200,364.72 and 81,525.60

Step by Step Solution

1. Step 1: Write the proportion equation
   145,200.12 : 200,364.72 = 81,525.60 : x
2. Step 2: Convert to fraction form
   145,200.12/200,364.72 = 81,525.60/x
3. Step 3: Cross multiply
   145,200.12x = 200,364.72 × 81,525.60
4. Step 4: Simplify right side
   145,200.12x = 16,334,854,016.83
5. Step 5: Solve for x
   x = 16,334,854,016.83/145,200.12
6. Step 6: Final answer
   x = 112,498.90