Finding the Fourth Proportional to 139,484.02, 192,496.89 and 78,235.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,484.02 : 192,496.89 = 78,235.96 : x
2. Step 2: Convert to fraction form
   139,484.02/192,496.89 = 78,235.96/x
3. Step 3: Cross multiply
   139,484.02x = 192,496.89 × 78,235.96
4. Step 4: Simplify right side
   139,484.02x = 15,060,178,986.16
5. Step 5: Solve for x
   x = 15,060,178,986.16/139,484.02
6. Step 6: Final answer
   x = 107,970.64