Finding the Fourth Proportional to 81,200.07, 121,504.86 and 67,028.31

Step by Step Solution

1. Step 1: Write the proportion equation
   81,200.07 : 121,504.86 = 67,028.31 : x
2. Step 2: Convert to fraction form
   81,200.07/121,504.86 = 67,028.31/x
3. Step 3: Cross multiply
   81,200.07x = 121,504.86 × 67,028.31
4. Step 4: Simplify right side
   81,200.07x = 8,144,265,422.59
5. Step 5: Solve for x
   x = 8,144,265,422.59/81,200.07
6. Step 6: Final answer
   x = 100,298.75