Finding the Fourth Proportional to 1,805.90, 2,492.06 and 1,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.90 : 2,492.06 = 1,215.50 : x
2. Step 2: Convert to fraction form
   1,805.90/2,492.06 = 1,215.50/x
3. Step 3: Cross multiply
   1,805.90x = 2,492.06 × 1,215.50
4. Step 4: Simplify right side
   1,805.90x = 3,029,098.93
5. Step 5: Solve for x
   x = 3,029,098.93/1,805.90
6. Step 6: Final answer
   x = 1,677.33