Finding the Fourth Proportional to 123,507.24, 170,377.38 and 78,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,507.24 : 170,377.38 = 78,108.72 : x
2. Step 2: Convert to fraction form
   123,507.24/170,377.38 = 78,108.72/x
3. Step 3: Cross multiply
   123,507.24x = 170,377.38 × 78,108.72
4. Step 4: Simplify right side
   123,507.24x = 13,307,959,068.75
5. Step 5: Solve for x
   x = 13,307,959,068.75/123,507.24
6. Step 6: Final answer
   x = 107,750.44