Finding the Fourth Proportional to 139,890.24, 209,718.72 and 69,672.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,890.24 : 209,718.72 = 69,672.96 : x
2. Step 2: Convert to fraction form
   139,890.24/209,718.72 = 69,672.96/x
3. Step 3: Cross multiply
   139,890.24x = 209,718.72 × 69,672.96
4. Step 4: Simplify right side
   139,890.24x = 14,611,723,989.81
5. Step 5: Solve for x
   x = 14,611,723,989.81/139,890.24
6. Step 6: Final answer
   x = 104,451.35