Finding the Fourth Proportional to 138,100.50, 190,578.89 and 81,511.88

Step by Step Solution

1. Step 1: Write the proportion equation
   138,100.50 : 190,578.89 = 81,511.88 : x
2. Step 2: Convert to fraction form
   138,100.50/190,578.89 = 81,511.88/x
3. Step 3: Cross multiply
   138,100.50x = 190,578.89 × 81,511.88
4. Step 4: Simplify right side
   138,100.50x = 15,534,442,863.10
5. Step 5: Solve for x
   x = 15,534,442,863.10/138,100.50
6. Step 6: Final answer
   x = 112,486.51