Finding the Fourth Proportional to 1,307.50, 1,804.31 and 718.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.50 : 1,804.31 = 718.00 : x
2. Step 2: Convert to fraction form
   1,307.50/1,804.31 = 718.00/x
3. Step 3: Cross multiply
   1,307.50x = 1,804.31 × 718.00
4. Step 4: Simplify right side
   1,307.50x = 1,295,495.50
5. Step 5: Solve for x
   x = 1,295,495.50/1,307.50
6. Step 6: Final answer
   x = 990.82