Finding the Fourth Proportional to 1,343.61, 1,856.59 and 1,288.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.61 : 1,856.59 = 1,288.94 : x
2. Step 2: Convert to fraction form
   1,343.61/1,856.59 = 1,288.94/x
3. Step 3: Cross multiply
   1,343.61x = 1,856.59 × 1,288.94
4. Step 4: Simplify right side
   1,343.61x = 2,393,020.61
5. Step 5: Solve for x
   x = 2,393,020.61/1,343.61
6. Step 6: Final answer
   x = 1,781.04