Finding the Fourth Proportional to 89,698.17, 122,887.10 and 86,335.05

Step by Step Solution

1. Step 1: Write the proportion equation
   89,698.17 : 122,887.10 = 86,335.05 : x
2. Step 2: Convert to fraction form
   89,698.17/122,887.10 = 86,335.05/x
3. Step 3: Cross multiply
   89,698.17x = 122,887.10 × 86,335.05
4. Step 4: Simplify right side
   89,698.17x = 10,609,463,491.18
5. Step 5: Solve for x
   x = 10,609,463,491.18/89,698.17
6. Step 6: Final answer
   x = 118,279.60