Finding the Fourth Proportional to 100,870.72, 139,235.16 and 69,131.68

Step by Step Solution

1. Step 1: Write the proportion equation
   100,870.72 : 139,235.16 = 69,131.68 : x
2. Step 2: Convert to fraction form
   100,870.72/139,235.16 = 69,131.68/x
3. Step 3: Cross multiply
   100,870.72x = 139,235.16 × 69,131.68
4. Step 4: Simplify right side
   100,870.72x = 9,625,560,525.87
5. Step 5: Solve for x
   x = 9,625,560,525.87/100,870.72
6. Step 6: Final answer
   x = 95,424.72