Finding the Fourth Proportional to 123,516.36, 170,389.71 and 78,118.02

Step by Step Solution

1. Step 1: Write the proportion equation
   123,516.36 : 170,389.71 = 78,118.02 : x
2. Step 2: Convert to fraction form
   123,516.36/170,389.71 = 78,118.02/x
3. Step 3: Cross multiply
   123,516.36x = 170,389.71 × 78,118.02
4. Step 4: Simplify right side
   123,516.36x = 13,310,506,773.57
5. Step 5: Solve for x
   x = 13,310,506,773.57/123,516.36
6. Step 6: Final answer
   x = 107,763.11