Finding the Fourth Proportional to 139,728.32, 192,824.53 and 78,466.01

Step by Step Solution

1. Step 1: Write the proportion equation
   139,728.32 : 192,824.53 = 78,466.01 : x
2. Step 2: Convert to fraction form
   139,728.32/192,824.53 = 78,466.01/x
3. Step 3: Cross multiply
   139,728.32x = 192,824.53 × 78,466.01
4. Step 4: Simplify right side
   139,728.32x = 15,130,170,142.77
5. Step 5: Solve for x
   x = 15,130,170,142.77/139,728.32
6. Step 6: Final answer
   x = 108,282.77