Finding the Fourth Proportional to 1,342.17, 2,012.72 and 417.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.17 : 2,012.72 = 417.42 : x
2. Step 2: Convert to fraction form
   1,342.17/2,012.72 = 417.42/x
3. Step 3: Cross multiply
   1,342.17x = 2,012.72 × 417.42
4. Step 4: Simplify right side
   1,342.17x = 840,147.50
5. Step 5: Solve for x
   x = 840,147.50/1,342.17
6. Step 6: Final answer
   x = 625.96