Finding the Fourth Proportional to 123,561.50, 170,533.08 and 78,243.62

Step by Step Solution

1. Step 1: Write the proportion equation
   123,561.50 : 170,533.08 = 78,243.62 : x
2. Step 2: Convert to fraction form
   123,561.50/170,533.08 = 78,243.62/x
3. Step 3: Cross multiply
   123,561.50x = 170,533.08 × 78,243.62
4. Step 4: Simplify right side
   123,561.50x = 13,343,124,656.28
5. Step 5: Solve for x
   x = 13,343,124,656.28/123,561.50
6. Step 6: Final answer
   x = 107,987.72