Finding the Fourth Proportional to 105,816.03, 158,663.89 and 81,791.83

Step by Step Solution

1. Step 1: Write the proportion equation
   105,816.03 : 158,663.89 = 81,791.83 : x
2. Step 2: Convert to fraction form
   105,816.03/158,663.89 = 81,791.83/x
3. Step 3: Cross multiply
   105,816.03x = 158,663.89 × 81,791.83
4. Step 4: Simplify right side
   105,816.03x = 12,977,409,918.02
5. Step 5: Solve for x
   x = 12,977,409,918.02/105,816.03
6. Step 6: Final answer
   x = 122,641.25