Finding the Fourth Proportional to 1,618.50, 2,234.72 and 1,432.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.50 : 2,234.72 = 1,432.20 : x
2. Step 2: Convert to fraction form
   1,618.50/2,234.72 = 1,432.20/x
3. Step 3: Cross multiply
   1,618.50x = 2,234.72 × 1,432.20
4. Step 4: Simplify right side
   1,618.50x = 3,200,565.98
5. Step 5: Solve for x
   x = 3,200,565.98/1,618.50
6. Step 6: Final answer
   x = 1,977.49