Finding the Fourth Proportional to 123,345.59, 170,198.69 and 72,339.08

Step by Step Solution

1. Step 1: Write the proportion equation
   123,345.59 : 170,198.69 = 72,339.08 : x
2. Step 2: Convert to fraction form
   123,345.59/170,198.69 = 72,339.08/x
3. Step 3: Cross multiply
   123,345.59x = 170,198.69 × 72,339.08
4. Step 4: Simplify right side
   123,345.59x = 12,312,015,439.12
5. Step 5: Solve for x
   x = 12,312,015,439.12/123,345.59
6. Step 6: Final answer
   x = 99,817.24