Finding the Fourth Proportional to 141,111.42, 211,342.41 and 81,800.70

Step by Step Solution

1. Step 1: Write the proportion equation
   141,111.42 : 211,342.41 = 81,800.70 : x
2. Step 2: Convert to fraction form
   141,111.42/211,342.41 = 81,800.70/x
3. Step 3: Cross multiply
   141,111.42x = 211,342.41 × 81,800.70
4. Step 4: Simplify right side
   141,111.42x = 17,287,957,077.69
5. Step 5: Solve for x
   x = 17,287,957,077.69/141,111.42
6. Step 6: Final answer
   x = 122,512.81