Finding the Fourth Proportional to 1,101.90, 1,521.62 and 709.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.90 : 1,521.62 = 709.59 : x
2. Step 2: Convert to fraction form
   1,101.90/1,521.62 = 709.59/x
3. Step 3: Cross multiply
   1,101.90x = 1,521.62 × 709.59
4. Step 4: Simplify right side
   1,101.90x = 1,079,726.34
5. Step 5: Solve for x
   x = 1,079,726.34/1,101.90
6. Step 6: Final answer
   x = 979.88