Finding the Fourth Proportional to 1,801.86, 2,487.51 and 1,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.86 : 2,487.51 = 1,212.72 : x
2. Step 2: Convert to fraction form
   1,801.86/2,487.51 = 1,212.72/x
3. Step 3: Cross multiply
   1,801.86x = 2,487.51 × 1,212.72
4. Step 4: Simplify right side
   1,801.86x = 3,016,653.13
5. Step 5: Solve for x
   x = 3,016,653.13/1,801.86
6. Step 6: Final answer
   x = 1,674.19