Finding the Fourth Proportional to 456,517.72, 684,642.78 and 172,003

Step by Step Solution

1. Step 1: Write the proportion equation
   456,517.72 : 684,642.78 = 172,003 : x
2. Step 2: Convert to fraction form
   456,517.72/684,642.78 = 172,003/x
3. Step 3: Cross multiply
   456,517.72x = 684,642.78 × 172,003
4. Step 4: Simplify right side
   456,517.72x = 117,760,612,088.34
5. Step 5: Solve for x
   x = 117,760,612,088.34/456,517.72
6. Step 6: Final answer
   x = 257,954.09