Finding the Fourth Proportional to 105,253.86, 157,905.42 and 71,989.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105,253.86 : 157,905.42 = 71,989.59 : x
2. Step 2: Convert to fraction form
   105,253.86/157,905.42 = 71,989.59/x
3. Step 3: Cross multiply
   105,253.86x = 157,905.42 × 71,989.59
4. Step 4: Simplify right side
   105,253.86x = 11,367,546,444.58
5. Step 5: Solve for x
   x = 11,367,546,444.58/105,253.86
6. Step 6: Final answer
   x = 108,001.23