Finding the Fourth Proportional to 139,870.51, 193,021.30 and 76,208.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,870.51 : 193,021.30 = 76,208.30 : x
2. Step 2: Convert to fraction form
   139,870.51/193,021.30 = 76,208.30/x
3. Step 3: Cross multiply
   139,870.51x = 193,021.30 × 76,208.30
4. Step 4: Simplify right side
   139,870.51x = 14,709,825,428.82
5. Step 5: Solve for x
   x = 14,709,825,428.82/139,870.51
6. Step 6: Final answer
   x = 105,167.46