Finding the Fourth Proportional to 139,314.90, 192,251.01 and 78,900.39

Step by Step Solution

1. Step 1: Write the proportion equation
   139,314.90 : 192,251.01 = 78,900.39 : x
2. Step 2: Convert to fraction form
   139,314.90/192,251.01 = 78,900.39/x
3. Step 3: Cross multiply
   139,314.90x = 192,251.01 × 78,900.39
4. Step 4: Simplify right side
   139,314.90x = 15,168,679,666.89
5. Step 5: Solve for x
   x = 15,168,679,666.89/139,314.90
6. Step 6: Final answer
   x = 108,880.53