Finding the Fourth Proportional to 1,861.20, 2,796.72 and 1,130.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.20 : 2,796.72 = 1,130.88 : x
2. Step 2: Convert to fraction form
   1,861.20/2,796.72 = 1,130.88/x
3. Step 3: Cross multiply
   1,861.20x = 2,796.72 × 1,130.88
4. Step 4: Simplify right side
   1,861.20x = 3,162,754.71
5. Step 5: Solve for x
   x = 3,162,754.71/1,861.20
6. Step 6: Final answer
   x = 1,699.31