Finding the Fourth Proportional to 139,402.05, 192,368.56 and 78,971.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,402.05 : 192,368.56 = 78,971.46 : x
2. Step 2: Convert to fraction form
   139,402.05/192,368.56 = 78,971.46/x
3. Step 3: Cross multiply
   139,402.05x = 192,368.56 × 78,971.46
4. Step 4: Simplify right side
   139,402.05x = 15,191,626,574.74
5. Step 5: Solve for x
   x = 15,191,626,574.74/139,402.05
6. Step 6: Final answer
   x = 108,977.07