Finding the Fourth Proportional to 123,936.64, 171,059.76 and 81,499.12

Step by Step Solution

1. Step 1: Write the proportion equation
   123,936.64 : 171,059.76 = 81,499.12 : x
2. Step 2: Convert to fraction form
   123,936.64/171,059.76 = 81,499.12/x
3. Step 3: Cross multiply
   123,936.64x = 171,059.76 × 81,499.12
4. Step 4: Simplify right side
   123,936.64x = 13,941,219,907.41
5. Step 5: Solve for x
   x = 13,941,219,907.41/123,936.64
6. Step 6: Final answer
   x = 112,486.67