Finding the Fourth Proportional to 85,870.24, 128,766.32 and 26,688.16

Step by Step Solution

1. Step 1: Write the proportion equation
   85,870.24 : 128,766.32 = 26,688.16 : x
2. Step 2: Convert to fraction form
   85,870.24/128,766.32 = 26,688.16/x
3. Step 3: Cross multiply
   85,870.24x = 128,766.32 × 26,688.16
4. Step 4: Simplify right side
   85,870.24x = 3,436,536,150.77
5. Step 5: Solve for x
   x = 3,436,536,150.77/85,870.24
6. Step 6: Final answer
   x = 40,020.11