Finding the Fourth Proportional to 103,665.35, 155,662.05 and 78,733.55

Step by Step Solution

1. Step 1: Write the proportion equation
   103,665.35 : 155,662.05 = 78,733.55 : x
2. Step 2: Convert to fraction form
   103,665.35/155,662.05 = 78,733.55/x
3. Step 3: Cross multiply
   103,665.35x = 155,662.05 × 78,733.55
4. Step 4: Simplify right side
   103,665.35x = 12,255,825,796.78
5. Step 5: Solve for x
   x = 12,255,825,796.78/103,665.35
6. Step 6: Final answer
   x = 118,224.90