Finding the Fourth Proportional to 1,663.69, 2,495.52 and 431.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.69 : 2,495.52 = 431.10 : x
2. Step 2: Convert to fraction form
   1,663.69/2,495.52 = 431.10/x
3. Step 3: Cross multiply
   1,663.69x = 2,495.52 × 431.10
4. Step 4: Simplify right side
   1,663.69x = 1,075,818.67
5. Step 5: Solve for x
   x = 1,075,818.67/1,663.69
6. Step 6: Final answer
   x = 646.65