Finding the Fourth Proportional to 1,207.50, 1,665.72 and 710.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.50 : 1,665.72 = 710.10 : x
2. Step 2: Convert to fraction form
   1,207.50/1,665.72 = 710.10/x
3. Step 3: Cross multiply
   1,207.50x = 1,665.72 × 710.10
4. Step 4: Simplify right side
   1,207.50x = 1,182,827.77
5. Step 5: Solve for x
   x = 1,182,827.77/1,207.50
6. Step 6: Final answer
   x = 979.57