Finding the Fourth Proportional to 72,405.45, 108,608.18 and 65,407.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,405.45 : 108,608.18 = 65,407.05 : x
2. Step 2: Convert to fraction form
   72,405.45/108,608.18 = 65,407.05/x
3. Step 3: Cross multiply
   72,405.45x = 108,608.18 × 65,407.05
4. Step 4: Simplify right side
   72,405.45x = 7,103,740,332.63
5. Step 5: Solve for x
   x = 7,103,740,332.63/72,405.45
6. Step 6: Final answer
   x = 98,110.58