Finding the Fourth Proportional to 1,011.50, 1,516.56 and 718.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.50 : 1,516.56 = 718.99 : x
2. Step 2: Convert to fraction form
   1,011.50/1,516.56 = 718.99/x
3. Step 3: Cross multiply
   1,011.50x = 1,516.56 × 718.99
4. Step 4: Simplify right side
   1,011.50x = 1,090,391.47
5. Step 5: Solve for x
   x = 1,090,391.47/1,011.50
6. Step 6: Final answer
   x = 1,077.99