Finding the Fourth Proportional to 1,405.50, 2,108.79 and 712.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.50 : 2,108.79 = 712.14 : x
2. Step 2: Convert to fraction form
   1,405.50/2,108.79 = 712.14/x
3. Step 3: Cross multiply
   1,405.50x = 2,108.79 × 712.14
4. Step 4: Simplify right side
   1,405.50x = 1,501,753.71
5. Step 5: Solve for x
   x = 1,501,753.71/1,405.50
6. Step 6: Final answer
   x = 1,068.48