Finding the Fourth Proportional to 1,538.34, 2,307.89 and 717.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.34 : 2,307.89 = 717.15 : x
2. Step 2: Convert to fraction form
   1,538.34/2,307.89 = 717.15/x
3. Step 3: Cross multiply
   1,538.34x = 2,307.89 × 717.15
4. Step 4: Simplify right side
   1,538.34x = 1,655,113.76
5. Step 5: Solve for x
   x = 1,655,113.76/1,538.34
6. Step 6: Final answer
   x = 1,075.91