Finding the Fourth Proportional to 123,530.88, 170,382.60 and 78,216.24

Step by Step Solution

1. Step 1: Write the proportion equation
   123,530.88 : 170,382.60 = 78,216.24 : x
2. Step 2: Convert to fraction form
   123,530.88/170,382.60 = 78,216.24/x
3. Step 3: Cross multiply
   123,530.88x = 170,382.60 × 78,216.24
4. Step 4: Simplify right side
   123,530.88x = 13,326,686,333.42
5. Step 5: Solve for x
   x = 13,326,686,333.42/123,530.88
6. Step 6: Final answer
   x = 107,881.42