Finding the Fourth Proportional to 123,422.67, 170,329.50 and 72,437.63

Step by Step Solution

1. Step 1: Write the proportion equation
   123,422.67 : 170,329.50 = 72,437.63 : x
2. Step 2: Convert to fraction form
   123,422.67/170,329.50 = 72,437.63/x
3. Step 3: Cross multiply
   123,422.67x = 170,329.50 × 72,437.63
4. Step 4: Simplify right side
   123,422.67x = 12,338,265,299.09
5. Step 5: Solve for x
   x = 12,338,265,299.09/123,422.67
6. Step 6: Final answer
   x = 99,967.58