Finding the Fourth Proportional to 1,065.72, 1,470.01 and 688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.72 : 1,470.01 = 688.10 : x
2. Step 2: Convert to fraction form
   1,065.72/1,470.01 = 688.10/x
3. Step 3: Cross multiply
   1,065.72x = 1,470.01 × 688.10
4. Step 4: Simplify right side
   1,065.72x = 1,011,504.17
5. Step 5: Solve for x
   x = 1,011,504.17/1,065.72
6. Step 6: Final answer
   x = 949.13