Finding the Fourth Proportional to 105,279.22, 145,311.20 and 88,256.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,279.22 : 145,311.20 = 88,256.50 : x
2. Step 2: Convert to fraction form
   105,279.22/145,311.20 = 88,256.50/x
3. Step 3: Cross multiply
   105,279.22x = 145,311.20 × 88,256.50
4. Step 4: Simplify right side
   105,279.22x = 12,824,657,922.80
5. Step 5: Solve for x
   x = 12,824,657,922.80/105,279.22
6. Step 6: Final answer
   x = 121,815.66