Finding the Fourth Proportional to 1,411.76, 2,117.69 and 487.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.76 : 2,117.69 = 487.31 : x
2. Step 2: Convert to fraction form
   1,411.76/2,117.69 = 487.31/x
3. Step 3: Cross multiply
   1,411.76x = 2,117.69 × 487.31
4. Step 4: Simplify right side
   1,411.76x = 1,031,971.51
5. Step 5: Solve for x
   x = 1,031,971.51/1,411.76
6. Step 6: Final answer
   x = 730.98