Finding the Fourth Proportional to 168,036.57, 231,840.72 and 99,999

Step by Step Solution

1. Step 1: Write the proportion equation
   168,036.57 : 231,840.72 = 99,999 : x
2. Step 2: Convert to fraction form
   168,036.57/231,840.72 = 99,999/x
3. Step 3: Cross multiply
   168,036.57x = 231,840.72 × 99,999
4. Step 4: Simplify right side
   168,036.57x = 23,183,840,159.28
5. Step 5: Solve for x
   x = 23,183,840,159.28/168,036.57
6. Step 6: Final answer
   x = 137,969.02