Finding the Fourth Proportional to 1,089.86, 1,636.98 and 651.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.86 : 1,636.98 = 651.98 : x
2. Step 2: Convert to fraction form
   1,089.86/1,636.98 = 651.98/x
3. Step 3: Cross multiply
   1,089.86x = 1,636.98 × 651.98
4. Step 4: Simplify right side
   1,089.86x = 1,067,278.22
5. Step 5: Solve for x
   x = 1,067,278.22/1,089.86
6. Step 6: Final answer
   x = 979.28