Finding the Fourth Proportional to 1,861.12, 2,788.72 and 983.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.12 : 2,788.72 = 983.59 : x
2. Step 2: Convert to fraction form
   1,861.12/2,788.72 = 983.59/x
3. Step 3: Cross multiply
   1,861.12x = 2,788.72 × 983.59
4. Step 4: Simplify right side
   1,861.12x = 2,742,957.10
5. Step 5: Solve for x
   x = 2,742,957.10/1,861.12
6. Step 6: Final answer
   x = 1,473.82