Finding the Fourth Proportional to 139,972.80, 193,162.56 and 76,310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,972.80 : 193,162.56 = 76,310.72 : x
2. Step 2: Convert to fraction form
   139,972.80/193,162.56 = 76,310.72/x
3. Step 3: Cross multiply
   139,972.80x = 193,162.56 × 76,310.72
4. Step 4: Simplify right side
   139,972.80x = 14,740,374,030.64
5. Step 5: Solve for x
   x = 14,740,374,030.64/139,972.80
6. Step 6: Final answer
   x = 105,308.85