Finding the Fourth Proportional to 141,139.31, 211,432.16 and 81,850.42

Step by Step Solution

1. Step 1: Write the proportion equation
   141,139.31 : 211,432.16 = 81,850.42 : x
2. Step 2: Convert to fraction form
   141,139.31/211,432.16 = 81,850.42/x
3. Step 3: Cross multiply
   141,139.31x = 211,432.16 × 81,850.42
4. Step 4: Simplify right side
   141,139.31x = 17,305,811,097.51
5. Step 5: Solve for x
   x = 17,305,811,097.51/141,139.31
6. Step 6: Final answer
   x = 122,615.10