Finding the Fourth Proportional to 1,608.05, 2,216.54 and 1,312.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.05 : 2,216.54 = 1,312.81 : x
2. Step 2: Convert to fraction form
   1,608.05/2,216.54 = 1,312.81/x
3. Step 3: Cross multiply
   1,608.05x = 2,216.54 × 1,312.81
4. Step 4: Simplify right side
   1,608.05x = 2,909,895.88
5. Step 5: Solve for x
   x = 2,909,895.88/1,608.05
6. Step 6: Final answer
   x = 1,809.58