Finding the Fourth Proportional to 172,118.10, 257,803.28 and 83,185.10

Step by Step Solution

1. Step 1: Write the proportion equation
   172,118.10 : 257,803.28 = 83,185.10 : x
2. Step 2: Convert to fraction form
   172,118.10/257,803.28 = 83,185.10/x
3. Step 3: Cross multiply
   172,118.10x = 257,803.28 × 83,185.10
4. Step 4: Simplify right side
   172,118.10x = 21,445,391,627.13
5. Step 5: Solve for x
   x = 21,445,391,627.13/172,118.10
6. Step 6: Final answer
   x = 124,596.96