Finding the Fourth Proportional to 139,867.50, 193,017.15 and 76,205.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,867.50 : 193,017.15 = 76,205.28 : x
2. Step 2: Convert to fraction form
   139,867.50/193,017.15 = 76,205.28/x
3. Step 3: Cross multiply
   139,867.50x = 193,017.15 × 76,205.28
4. Step 4: Simplify right side
   139,867.50x = 14,708,925,960.55
5. Step 5: Solve for x
   x = 14,708,925,960.55/139,867.50
6. Step 6: Final answer
   x = 105,163.29