Finding the Fourth Proportional to 1,665.61, 2,498.42 and 432.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.61 : 2,498.42 = 432.94 : x
2. Step 2: Convert to fraction form
   1,665.61/2,498.42 = 432.94/x
3. Step 3: Cross multiply
   1,665.61x = 2,498.42 × 432.94
4. Step 4: Simplify right side
   1,665.61x = 1,081,665.95
5. Step 5: Solve for x
   x = 1,081,665.95/1,665.61
6. Step 6: Final answer
   x = 649.41