Finding the Fourth Proportional to 1,487.31, 2,227.05 and 1,312.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.31 : 2,227.05 = 1,312.16 : x
2. Step 2: Convert to fraction form
   1,487.31/2,227.05 = 1,312.16/x
3. Step 3: Cross multiply
   1,487.31x = 2,227.05 × 1,312.16
4. Step 4: Simplify right side
   1,487.31x = 2,922,234.79
5. Step 5: Solve for x
   x = 2,922,234.79/1,487.31
6. Step 6: Final answer
   x = 1,964.78