Finding the Fourth Proportional to 1,147.25, 1,720.71 and 407.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.25 : 1,720.71 = 407.00 : x
2. Step 2: Convert to fraction form
   1,147.25/1,720.71 = 407.00/x
3. Step 3: Cross multiply
   1,147.25x = 1,720.71 × 407.00
4. Step 4: Simplify right side
   1,147.25x = 700,320.37
5. Step 5: Solve for x
   x = 700,320.37/1,147.25
6. Step 6: Final answer
   x = 610.44