Finding the Fourth Proportional to 1,343.60, 1,856.21 and 1,074.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.60 : 1,856.21 = 1,074.99 : x
2. Step 2: Convert to fraction form
   1,343.60/1,856.21 = 1,074.99/x
3. Step 3: Cross multiply
   1,343.60x = 1,856.21 × 1,074.99
4. Step 4: Simplify right side
   1,343.60x = 1,995,407.19
5. Step 5: Solve for x
   x = 1,995,407.19/1,343.60
6. Step 6: Final answer
   x = 1,485.12