Finding the Fourth Proportional to 3,061.18, 4,590.72 and 1,211.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,061.18 : 4,590.72 = 1,211.80 : x
2. Step 2: Convert to fraction form
   3,061.18/4,590.72 = 1,211.80/x
3. Step 3: Cross multiply
   3,061.18x = 4,590.72 × 1,211.80
4. Step 4: Simplify right side
   3,061.18x = 5,563,034.50
5. Step 5: Solve for x
   x = 5,563,034.50/3,061.18
6. Step 6: Final answer
   x = 1,817.28