Finding the Fourth Proportional to 1,072.88, 1,606.71 and 707.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.88 : 1,606.71 = 707.30 : x
2. Step 2: Convert to fraction form
   1,072.88/1,606.71 = 707.30/x
3. Step 3: Cross multiply
   1,072.88x = 1,606.71 × 707.30
4. Step 4: Simplify right side
   1,072.88x = 1,136,425.98
5. Step 5: Solve for x
   x = 1,136,425.98/1,072.88
6. Step 6: Final answer
   x = 1,059.23