Finding the Fourth Proportional to 123,399.76, 170,281.98 and 69,690.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123,399.76 : 170,281.98 = 69,690.10 : x
2. Step 2: Convert to fraction form
   123,399.76/170,281.98 = 69,690.10/x
3. Step 3: Cross multiply
   123,399.76x = 170,281.98 × 69,690.10
4. Step 4: Simplify right side
   123,399.76x = 11,866,968,214.40
5. Step 5: Solve for x
   x = 11,866,968,214.40/123,399.76
6. Step 6: Final answer
   x = 96,166.87