Finding the Fourth Proportional to 1,328.00, 1,991.89 and 462.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.00 : 1,991.89 = 462.31 : x
2. Step 2: Convert to fraction form
   1,328.00/1,991.89 = 462.31/x
3. Step 3: Cross multiply
   1,328.00x = 1,991.89 × 462.31
4. Step 4: Simplify right side
   1,328.00x = 920,866.26
5. Step 5: Solve for x
   x = 920,866.26/1,328.00
6. Step 6: Final answer
   x = 693.43