Finding the Fourth Proportional to 139,858.38, 193,008.32 and 76,200.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,858.38 : 193,008.32 = 76,200.28 : x
2. Step 2: Convert to fraction form
   139,858.38/193,008.32 = 76,200.28/x
3. Step 3: Cross multiply
   139,858.38x = 193,008.32 × 76,200.28
4. Step 4: Simplify right side
   139,858.38x = 14,707,287,448.56
5. Step 5: Solve for x
   x = 14,707,287,448.56/139,858.38
6. Step 6: Final answer
   x = 105,158.43