Finding the Fourth Proportional to 89,722.17, 122,919.98 and 86,359.05

Step by Step Solution

1. Step 1: Write the proportion equation
   89,722.17 : 122,919.98 = 86,359.05 : x
2. Step 2: Convert to fraction form
   89,722.17/122,919.98 = 86,359.05/x
3. Step 3: Cross multiply
   89,722.17x = 122,919.98 × 86,359.05
4. Step 4: Simplify right side
   89,722.17x = 10,615,252,267.02
5. Step 5: Solve for x
   x = 10,615,252,267.02/89,722.17
6. Step 6: Final answer
   x = 118,312.48