Finding the Fourth Proportional to 103,667.35, 155,665.05 and 78,735.55

Step by Step Solution

1. Step 1: Write the proportion equation
   103,667.35 : 155,665.05 = 78,735.55 : x
2. Step 2: Convert to fraction form
   103,667.35/155,665.05 = 78,735.55/x
3. Step 3: Cross multiply
   103,667.35x = 155,665.05 × 78,735.55
4. Step 4: Simplify right side
   103,667.35x = 12,256,373,327.53
5. Step 5: Solve for x
   x = 12,256,373,327.53/103,667.35
6. Step 6: Final answer
   x = 118,227.90