Finding the Fourth Proportional to 1,242.71, 1,715.01 and 718.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.71 : 1,715.01 = 718.82 : x
2. Step 2: Convert to fraction form
   1,242.71/1,715.01 = 718.82/x
3. Step 3: Cross multiply
   1,242.71x = 1,715.01 × 718.82
4. Step 4: Simplify right side
   1,242.71x = 1,232,783.49
5. Step 5: Solve for x
   x = 1,232,783.49/1,242.71
6. Step 6: Final answer
   x = 992.01