Finding the Fourth Proportional to 103,665.10, 155,661.68 and 78,733.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,665.10 : 155,661.68 = 78,733.30 : x
2. Step 2: Convert to fraction form
   103,665.10/155,661.68 = 78,733.30/x
3. Step 3: Cross multiply
   103,665.10x = 155,661.68 × 78,733.30
4. Step 4: Simplify right side
   103,665.10x = 12,255,757,356.28
5. Step 5: Solve for x
   x = 12,255,757,356.28/103,665.10
6. Step 6: Final answer
   x = 118,224.53