Finding the Fourth Proportional to 2,861.59, 4,290.20 and 1,981.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.59 : 4,290.20 = 1,981.56 : x
2. Step 2: Convert to fraction form
   2,861.59/4,290.20 = 1,981.56/x
3. Step 3: Cross multiply
   2,861.59x = 4,290.20 × 1,981.56
4. Step 4: Simplify right side
   2,861.59x = 8,501,302.32
5. Step 5: Solve for x
   x = 8,501,302.32/2,861.59
6. Step 6: Final answer
   x = 2,970.83