Finding the Fourth Proportional to 139,554.28, 209,236.69 and 70,997.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139,554.28 : 209,236.69 = 70,997.34 : x
2. Step 2: Convert to fraction form
   139,554.28/209,236.69 = 70,997.34/x
3. Step 3: Cross multiply
   139,554.28x = 209,236.69 × 70,997.34
4. Step 4: Simplify right side
   139,554.28x = 14,855,248,827.47
5. Step 5: Solve for x
   x = 14,855,248,827.47/139,554.28
6. Step 6: Final answer
   x = 106,447.82