Finding the Fourth Proportional to 105,615.41, 158,755.28 and 91,748.13

Step by Step Solution

1. Step 1: Write the proportion equation
   105,615.41 : 158,755.28 = 91,748.13 : x
2. Step 2: Convert to fraction form
   105,615.41/158,755.28 = 91,748.13/x
3. Step 3: Cross multiply
   105,615.41x = 158,755.28 × 91,748.13
4. Step 4: Simplify right side
   105,615.41x = 14,565,499,608.89
5. Step 5: Solve for x
   x = 14,565,499,608.89/105,615.41
6. Step 6: Final answer
   x = 137,910.75