Finding the Fourth Proportional to 81,105.68, 121,558.08 and 45,938.72

Step by Step Solution

1. Step 1: Write the proportion equation
   81,105.68 : 121,558.08 = 45,938.72 : x
2. Step 2: Convert to fraction form
   81,105.68/121,558.08 = 45,938.72/x
3. Step 3: Cross multiply
   81,105.68x = 121,558.08 × 45,938.72
4. Step 4: Simplify right side
   81,105.68x = 5,584,222,600.86
5. Step 5: Solve for x
   x = 5,584,222,600.86/81,105.68
6. Step 6: Final answer
   x = 68,851.19