Finding the Fourth Proportional to 172,111.08, 258,196.70 and 78,626.28

Step by Step Solution

1. Step 1: Write the proportion equation
   172,111.08 : 258,196.70 = 78,626.28 : x
2. Step 2: Convert to fraction form
   172,111.08/258,196.70 = 78,626.28/x
3. Step 3: Cross multiply
   172,111.08x = 258,196.70 × 78,626.28
4. Step 4: Simplify right side
   172,111.08x = 20,301,046,029.28
5. Step 5: Solve for x
   x = 20,301,046,029.28/172,111.08
6. Step 6: Final answer
   x = 117,953.16