Finding the Fourth Proportional to 139,978.76, 193,165.07 and 76,315.19

Step by Step Solution

1. Step 1: Write the proportion equation
   139,978.76 : 193,165.07 = 76,315.19 : x
2. Step 2: Convert to fraction form
   139,978.76/193,165.07 = 76,315.19/x
3. Step 3: Cross multiply
   139,978.76x = 193,165.07 × 76,315.19
4. Step 4: Simplify right side
   139,978.76x = 14,741,427,671.01
5. Step 5: Solve for x
   x = 14,741,427,671.01/139,978.76
6. Step 6: Final answer
   x = 105,311.89