Finding the Fourth Proportional to 72,689.10, 108,997.20 and 33,201.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,689.10 : 108,997.20 = 33,201.60 : x
2. Step 2: Convert to fraction form
   72,689.10/108,997.20 = 33,201.60/x
3. Step 3: Cross multiply
   72,689.10x = 108,997.20 × 33,201.60
4. Step 4: Simplify right side
   72,689.10x = 3,618,881,435.52
5. Step 5: Solve for x
   x = 3,618,881,435.52/72,689.10
6. Step 6: Final answer
   x = 49,785.75